diff --git a/frontend/src/features/first-run/FirstRunWizard.test.tsx b/frontend/src/features/first-run/FirstRunWizard.test.tsx
index 899e66b..cad4762 100644
--- a/frontend/src/features/first-run/FirstRunWizard.test.tsx
+++ b/frontend/src/features/first-run/FirstRunWizard.test.tsx
@@ -14,7 +14,11 @@ import {
 } from "@testing-library/react";
 
 import { MockModelServerGateway, MockProfileGateway } from "@/adapters/mock";
-import type { LocalModelServerConfig, ProfileAvailability } from "@/domain";
+import type {
+  AgentProfile,
+  LocalModelServerConfig,
+  ProfileAvailability,
+} from "@/domain";
 import type { Gateways } from "@/ports";
 import { DIProvider } from "@/app/di";
 import { FirstRunWizard } from "./FirstRunWizard";
@@ -553,3 +557,186 @@ describe("FirstRunWizard reopening after the first run (forceOpen)", () => {
     expect(await screen.findByLabelText("first run setup")).toBeTruthy();
   });
 });
+
+// Ticket #44 — reopening the wizard from Settings (`forceOpen` ⇒ edit mode) must
+// pre-fill the already-configured profiles, pre-selected with their real config,
+// so a save doesn't silently drop them and generic reference candidates don't
+// take over. Dedup is by id only; several local OpenCode profiles are preserved.
+describe("FirstRunWizard edit mode reopening (#44)", () => {
+  const injection = {
+    strategy: "conventionFile" as const,
+    target: "AGENTS.md",
+  };
+  function openCodeProfile(
+    id: string,
+    name: string,
+    baseURL: string,
+    model = "qwen3-coder-30b",
+  ): AgentProfile {
+    return {
+      id,
+      name,
+      command: "opencode",
+      args: [],
+      contextInjection: injection,
+      detect: "opencode --version",
+      cwdTemplate: "{projectRoot}",
+      structuredAdapter: "openCode",
+      opencode: { baseURL, apiKey: "sk-x", model },
+    };
+  }
+
+  function renderEdit(profile: MockProfileGateway) {
+    const gateways = {
+      profile,
+      modelServer: new MockModelServerGateway(),
+    } as unknown as Gateways;
+    return render(
+      <DIProvider gateways={gateways}>
+        <FirstRunWizard forceOpen />
+      </DIProvider>,
+    );
+  }
+
+  it("pre-fills the configured profiles, pre-selected, with config intact", async () => {
+    const profile = new MockProfileGateway();
+    await profile.configureProfiles([
+      openCodeProfile("cfg-oc-1", "Local A", "http://localhost:9090/v1", "qwen3-coder-14b"),
+    ]);
+
+    renderEdit(profile);
+    await waitForLoaded();
+
+    // The configured OpenCode comes back checked, with its real endpoint/model.
+    expect(
+      (screen.getByLabelText("use Local A") as HTMLInputElement).checked,
+    ).toBe(true);
+    expect(
+      (screen.getByLabelText("Local A base url") as HTMLInputElement).value,
+    ).toBe("http://localhost:9090/v1");
+    expect(
+      (screen.getByLabelText("Local A model") as HTMLInputElement).value,
+    ).toBe("qwen3-coder-14b");
+  });
+
+  it("does not duplicate a configured reference (matched by id, configured wins)", async () => {
+    // The reference OpenCode (id `mock-opencode`) was edited and is now
+    // configured under the same id — it must appear exactly once, pre-selected.
+    const profile = new MockProfileGateway();
+    await profile.configureProfiles([
+      openCodeProfile("mock-opencode", "OpenCode (edited)", "http://localhost:7777/v1"),
+    ]);
+
+    renderEdit(profile);
+    await waitForLoaded();
+
+    // Exactly one row for the edited OpenCode; the generic reference name is gone.
+    expect(screen.getAllByText("OpenCode (edited)")).toHaveLength(1);
+    expect(screen.queryByText("OpenCode + llama.cpp")).toBeNull();
+    expect(
+      (screen.getByLabelText("use OpenCode (edited)") as HTMLInputElement).checked,
+    ).toBe(true);
+  });
+
+  it("keeps several distinct OpenCode profiles (same command, different ids)", async () => {
+    const profile = new MockProfileGateway();
+    await profile.configureProfiles([
+      openCodeProfile("oc-1", "Local A", "http://localhost:8080/v1"),
+      openCodeProfile("oc-2", "Local B", "http://localhost:9191/v1"),
+    ]);
+
+    renderEdit(profile);
+    await waitForLoaded();
+
+    // Both distinct profiles are present and pre-selected, none collapsed.
+    expect(
+      (screen.getByLabelText("use Local A") as HTMLInputElement).checked,
+    ).toBe(true);
+    expect(
+      (screen.getByLabelText("use Local B") as HTMLInputElement).checked,
+    ).toBe(true);
+    expect(
+      (screen.getByLabelText("Local A base url") as HTMLInputElement).value,
+    ).toBe("http://localhost:8080/v1");
+    expect(
+      (screen.getByLabelText("Local B base url") as HTMLInputElement).value,
+    ).toBe("http://localhost:9191/v1");
+  });
+
+  it("saving in edit mode does not drop configured profiles by omission", async () => {
+    const profile = new MockProfileGateway();
+    await profile.configureProfiles([
+      openCodeProfile("oc-1", "Local A", "http://localhost:8080/v1"),
+      openCodeProfile("oc-2", "Local B", "http://localhost:9191/v1"),
+    ]);
+
+    renderEdit(profile);
+    await waitForLoaded();
+    // Save straight away without touching anything.
+    fireEvent.click(screen.getByRole("button", { name: "Save and continue" }));
+
+    await waitFor(async () => {
+      const saved = await profile.listProfiles();
+      expect(saved.map((p) => p.id).sort()).toEqual(["oc-1", "oc-2"]);
+      // Real config preserved through the round-trip.
+      expect(
+        saved.find((p) => p.id === "oc-1")?.opencode?.baseURL,
+      ).toBe("http://localhost:8080/v1");
+    });
+  });
+
+  it("unchecking a configured row removes it on save (deliberate deletion)", async () => {
+    const profile = new MockProfileGateway();
+    await profile.configureProfiles([
+      openCodeProfile("oc-1", "Local A", "http://localhost:8080/v1"),
+      openCodeProfile("oc-2", "Local B", "http://localhost:9191/v1"),
+    ]);
+
+    renderEdit(profile);
+    await waitForLoaded();
+    // Deselect Local B, then save — an explicit removal, not an omission.
+    fireEvent.click(screen.getByLabelText("use Local B"));
+    fireEvent.click(screen.getByRole("button", { name: "Save and continue" }));
+
+    await waitFor(async () => {
+      const saved = await profile.listProfiles();
+      expect(saved.map((p) => p.id)).toEqual(["oc-1"]);
+    });
+  });
+
+  it("auto-detection in edit mode does not re-check or uncheck the initial selection", async () => {
+    // A configured Codex (not installed per the mock) reuses the reference id, so
+    // it dedups to one pre-selected row. Claude is installed but only a reference.
+    const profile = new MockProfileGateway();
+    await profile.configureProfiles([
+      {
+        id: "mock-codex",
+        name: "Codex Configured",
+        command: "codex",
+        args: [],
+        contextInjection: injection,
+        detect: "codex --version",
+        cwdTemplate: "{projectRoot}",
+      },
+    ]);
+
+    renderEdit(profile);
+    await waitForLoaded();
+
+    // Wait until detection has filled availability (Claude reads as installed).
+    await waitFor(() =>
+      expect(
+        screen.getByLabelText("Claude Code availability").textContent,
+      ).toMatch(/installed/),
+    );
+
+    // Selection is untouched by detection: the configured (uninstalled) Codex
+    // stays checked; the installed Claude reference stays UNchecked.
+    expect(
+      (screen.getByLabelText("use Codex Configured") as HTMLInputElement).checked,
+    ).toBe(true);
+    expect(
+      (screen.getByLabelText("use Claude Code") as HTMLInputElement).checked,
+    ).toBe(false);
+  });
+});
diff --git a/frontend/src/features/first-run/FirstRunWizard.tsx b/frontend/src/features/first-run/FirstRunWizard.tsx
index 3d89460..986e743 100644
--- a/frontend/src/features/first-run/FirstRunWizard.tsx
+++ b/frontend/src/features/first-run/FirstRunWizard.tsx
@@ -57,7 +57,10 @@ export function FirstRunWizard({
   /** Render the wizard even when it is no longer the first run. */
   forceOpen?: boolean;
 }) {
-  const vm = useFirstRun();
+  // Mode is explicit (ticket #44), driven by the entry point — never inferred
+  // from `isFirstRun`: reopening from Settings (`forceOpen`) is the "edit" mode,
+  // which pre-loads and pre-selects the already-configured profiles.
+  const vm = useFirstRun(forceOpen ? "edit" : "firstRun");
   const modelServers = useModelServers();
 
   if (vm.isFirstRun === null) return null;
diff --git a/frontend/src/features/first-run/useFirstRun.ts b/frontend/src/features/first-run/useFirstRun.ts
index 0cc1f8a..c2c0531 100644
--- a/frontend/src/features/first-run/useFirstRun.ts
+++ b/frontend/src/features/first-run/useFirstRun.ts
@@ -23,18 +23,13 @@ import type {
   ProfileAvailability,
 } from "@/domain";
 import { useGateways } from "@/app/di";
+import { buildWizardEntries, type WizardEntry, type WizardMode } from "./wizardEntries";
+
+export type { WizardEntry, WizardMode } from "./wizardEntries";
 
 /** How long the UI waits for a detection round before giving up on it. */
 export const DETECT_TIMEOUT_MS = 3_000;
 
-/** One row in the wizard: a candidate profile, selected state, availability. */
-export interface WizardEntry {
-  profile: AgentProfile;
-  selected: boolean;
-  /** `null` until detection ran; then `true`/`false`. */
-  available: boolean | null;
-}
-
 /** What the first-run wizard UI needs from this hook. */
 export interface FirstRunViewModel {
   /** Whether the wizard should be shown (null while loading). */
@@ -77,7 +72,13 @@ function describe(e: unknown): string {
   return String(e);
 }
 
-export function useFirstRun(): FirstRunViewModel {
+/**
+ * @param mode Which wizard to build (ticket #44): `"firstRun"` (default) for the
+ * very first launch, or `"edit"` when reopened via *Settings ▸ Configure
+ * profiles* — the latter pre-loads and pre-selects the already-configured
+ * profiles and does NOT let detection alter that initial selection.
+ */
+export function useFirstRun(mode: WizardMode = "firstRun"): FirstRunViewModel {
   const { profile } = useGateways();
   const [isFirstRun, setIsFirstRun] = useState<boolean | null>(null);
   const [entries, setEntries] = useState<WizardEntry[]>([]);
@@ -154,15 +155,25 @@ export function useFirstRun(): FirstRunViewModel {
   const reload = useCallback(async () => {
     setBusy(true);
     setError(null);
-    let refs: AgentProfile[] | null = null;
+    let candidates: AgentProfile[] | null = null;
     try {
-      const state: FirstRunState = await profile.firstRunState();
+      // In edit mode we also load the already-configured profiles so they come
+      // back pre-selected with their real config (ticket #44). Fetched together
+      // so a single blocking window covers the whole load.
+      const [state, configured]: [FirstRunState, AgentProfile[]] =
+        await Promise.all([
+          profile.firstRunState(),
+          mode === "edit" ? profile.listProfiles() : Promise.resolve([]),
+        ]);
       setIsFirstRun(state.isFirstRun);
-      refs = state.referenceProfiles;
-      // Show the rows immediately (nothing pre-checked yet).
-      setEntries(
-        refs.map((p) => ({ profile: p, selected: false, available: null })),
-      );
+      const built = buildWizardEntries({
+        mode,
+        configured,
+        references: state.referenceProfiles,
+      });
+      candidates = built.map((e) => e.profile);
+      // Show the rows immediately (availability not probed yet).
+      setEntries(built);
     } catch (e) {
       setError(describe(e));
       setIsFirstRun(false);
@@ -171,13 +182,18 @@ export function useFirstRun(): FirstRunViewModel {
       setBusy(false);
     }
 
-    // Auto-detect once on open, detached: only the CLIs actually installed end
-    // up pre-checked. The manual "Detect installed CLIs" button stays available
-    // to re-probe, whatever happens to this round.
-    if (refs !== null) {
-      void runDetection(refs, { preselect: true, reportError: false });
+    // Auto-detect once on open, detached: only fills availability. In firstRun
+    // mode it also pre-checks the installed CLIs (`preselect`); in edit mode it
+    // must NOT touch the initial selection — the configured profiles stay
+    // selected and references stay unselected (ticket #44), so `preselect:false`.
+    // The manual "Detect installed CLIs" button stays available to re-probe.
+    if (candidates !== null) {
+      void runDetection(candidates, {
+        preselect: mode === "firstRun",
+        reportError: false,
+      });
     }
-  }, [profile, runDetection]);
+  }, [profile, runDetection, mode]);
 
   useEffect(() => {
     void reload();
diff --git a/frontend/src/features/first-run/wizardEntries.test.ts b/frontend/src/features/first-run/wizardEntries.test.ts
new file mode 100644
index 0000000..d3478e6
--- /dev/null
+++ b/frontend/src/features/first-run/wizardEntries.test.ts
@@ -0,0 +1,173 @@
+/**
+ * #44 — pure construction of the wizard rows. Covers the two modes and the
+ * strict id-only deduplication that keeps several OpenCode profiles distinct.
+ */
+import { describe, it, expect } from "vitest";
+
+import type { AgentProfile } from "@/domain";
+import { buildWizardEntries } from "./wizardEntries";
+
+/** Minimal profile factory (only the fields the helper reads/carries). */
+function profile(id: string, over: Partial<AgentProfile> = {}): AgentProfile {
+  return {
+    id,
+    name: id,
+    command: "claude",
+    args: [],
+    contextInjection: { strategy: "conventionFile", target: "CLAUDE.md" },
+    detect: "claude --version",
+    cwdTemplate: "{projectRoot}",
+    ...over,
+  };
+}
+
+const REFERENCES: AgentProfile[] = [
+  profile("mock-claude", { name: "Claude Code", command: "claude" }),
+  profile("mock-codex", { name: "Codex", command: "codex" }),
+  profile("mock-opencode", {
+    name: "OpenCode",
+    command: "opencode",
+    structuredAdapter: "openCode",
+  }),
+];
+
+describe("buildWizardEntries — firstRun mode", () => {
+  it("maps references to unselected rows with unknown availability", () => {
+    const entries = buildWizardEntries({
+      mode: "firstRun",
+      configured: [],
+      references: REFERENCES,
+    });
+    expect(entries).toHaveLength(3);
+    expect(entries.every((e) => e.selected === false)).toBe(true);
+    expect(entries.every((e) => e.available === null)).toBe(true);
+    expect(entries.map((e) => e.profile.id)).toEqual([
+      "mock-claude",
+      "mock-codex",
+      "mock-opencode",
+    ]);
+  });
+
+  it("ignores configured profiles entirely in firstRun mode", () => {
+    const entries = buildWizardEntries({
+      mode: "firstRun",
+      configured: [profile("mock-claude")],
+      references: REFERENCES,
+    });
+    // Still exactly the reference rows, all unselected.
+    expect(entries.map((e) => e.profile.id)).toEqual([
+      "mock-claude",
+      "mock-codex",
+      "mock-opencode",
+    ]);
+    expect(entries.every((e) => e.selected === false)).toBe(true);
+  });
+});
+
+describe("buildWizardEntries — edit mode", () => {
+  it("puts configured profiles first, pre-selected, config intact", () => {
+    const configured = [
+      profile("cfg-oc-1", {
+        name: "Local A",
+        command: "opencode",
+        structuredAdapter: "openCode",
+        opencode: {
+          baseURL: "http://localhost:9090/v1",
+          apiKey: "sk-a",
+          model: "qwen3-coder-14b",
+        },
+      }),
+    ];
+    const entries = buildWizardEntries({
+      mode: "edit",
+      configured,
+      references: REFERENCES,
+    });
+
+    const first = entries[0];
+    expect(first.profile.id).toBe("cfg-oc-1");
+    expect(first.selected).toBe(true);
+    // Real config carried through untouched.
+    expect(first.profile.opencode?.baseURL).toBe("http://localhost:9090/v1");
+    expect(first.profile.opencode?.model).toBe("qwen3-coder-14b");
+    // Then all three references follow, unselected.
+    expect(entries.slice(1).map((e) => e.profile.id)).toEqual([
+      "mock-claude",
+      "mock-codex",
+      "mock-opencode",
+    ]);
+    expect(entries.slice(1).every((e) => e.selected === false)).toBe(true);
+  });
+
+  it("deduplicates by id only: a configured reference is not shown twice", () => {
+    // The user edited the OpenCode reference and it is now configured under the
+    // SAME id — it must appear once (the configured, pre-selected version wins).
+    const configured = [
+      profile("mock-opencode", {
+        name: "OpenCode (edited)",
+        command: "opencode",
+        structuredAdapter: "openCode",
+      }),
+    ];
+    const entries = buildWizardEntries({
+      mode: "edit",
+      configured,
+      references: REFERENCES,
+    });
+
+    const ocRows = entries.filter((e) => e.profile.id === "mock-opencode");
+    expect(ocRows).toHaveLength(1);
+    expect(ocRows[0].selected).toBe(true);
+    expect(ocRows[0].profile.name).toBe("OpenCode (edited)"); // configured wins
+    // The other references remain (unselected).
+    expect(entries.map((e) => e.profile.id)).toEqual([
+      "mock-opencode",
+      "mock-claude",
+      "mock-codex",
+    ]);
+  });
+
+  it("keeps several distinct OpenCode profiles that share command/adapter", () => {
+    // Same command + structuredAdapter, different ids ⇒ distinct identities: all
+    // preserved. Never matched/collapsed by command/adapter/endpoint/model.
+    const configured = [
+      profile("oc-1", {
+        command: "opencode",
+        structuredAdapter: "openCode",
+        opencode: { baseURL: "http://a/v1", model: "m", apiKey: "" },
+      }),
+      profile("oc-2", {
+        command: "opencode",
+        structuredAdapter: "openCode",
+        opencode: { baseURL: "http://b/v1", model: "m", apiKey: "" },
+      }),
+    ];
+    const entries = buildWizardEntries({
+      mode: "edit",
+      configured,
+      references: REFERENCES,
+    });
+
+    const ocIds = entries
+      .filter((e) => e.profile.structuredAdapter === "openCode")
+      .map((e) => e.profile.id);
+    // Both configured OpenCode + the reference OpenCode (different id) survive.
+    expect(ocIds).toEqual(["oc-1", "oc-2", "mock-opencode"]);
+    expect(entries[0].selected).toBe(true);
+    expect(entries[1].selected).toBe(true);
+  });
+
+  it("with no configured profiles behaves like references-only, still unselected", () => {
+    const entries = buildWizardEntries({
+      mode: "edit",
+      configured: [],
+      references: REFERENCES,
+    });
+    expect(entries.map((e) => e.profile.id)).toEqual([
+      "mock-claude",
+      "mock-codex",
+      "mock-opencode",
+    ]);
+    expect(entries.every((e) => e.selected === false)).toBe(true);
+  });
+});
diff --git a/frontend/src/features/first-run/wizardEntries.ts b/frontend/src/features/first-run/wizardEntries.ts
new file mode 100644
index 0000000..e6beffb
--- /dev/null
+++ b/frontend/src/features/first-run/wizardEntries.ts
@@ -0,0 +1,73 @@
+/**
+ * Pure construction of the first-run/edit wizard rows (ticket #44).
+ *
+ * The wizard runs in one of two **modes**, passed explicitly (never inferred
+ * from `isFirstRun`):
+ *
+ *  - `"firstRun"` — the very first launch. Rows come from the selectable
+ *    reference catalogue only, all unselected, availability unknown. Detection
+ *    later pre-checks the installed CLIs.
+ *  - `"edit"` — reopened via *Settings ▸ Configure profiles*. The user already
+ *    configured profiles (possibly several local OpenCode ones with distinct
+ *    endpoints); those must come back **pre-selected with their real config**, so
+ *    a save doesn't silently drop them. Reference profiles are still offered, but
+ *    only those not already configured — deduplicated **by `id` only**.
+ *
+ * Deduplication is by `profile.id` and nothing else: several OpenCode profiles
+ * legitimately share the same `command`/`structuredAdapter` while differing in
+ * endpoint/model, so their product identity is the id. A reference is "already
+ * configured" iff a configured profile carries the same id.
+ */
+
+import type { AgentProfile } from "@/domain";
+
+/** Which wizard the rows are being built for (ticket #44). */
+export type WizardMode = "firstRun" | "edit";
+
+/** One row in the wizard: a candidate profile, selected state, availability. */
+export interface WizardEntry {
+  profile: AgentProfile;
+  selected: boolean;
+  /** `null` until detection ran; then `true`/`false`. */
+  available: boolean | null;
+}
+
+/**
+ * Builds the wizard rows for the given mode. Pure — no I/O, no React — so every
+ * invariant (pre-selection, id-only dedup, ordering) is unit-testable.
+ *
+ * `firstRun`: references only, all `selected:false`, `available:null`.
+ * `edit`: the configured profiles first (pre-selected, real config intact), then
+ * the reference profiles whose id is not already configured (`selected:false`).
+ */
+export function buildWizardEntries({
+  mode,
+  configured,
+  references,
+}: {
+  mode: WizardMode;
+  configured: AgentProfile[];
+  references: AgentProfile[];
+}): WizardEntry[] {
+  if (mode === "firstRun") {
+    return references.map((profile) => ({
+      profile,
+      selected: false,
+      available: null,
+    }));
+  }
+
+  // Edit mode: configured profiles come first, pre-selected and untouched.
+  const configuredIds = new Set(configured.map((p) => p.id));
+  const configuredEntries: WizardEntry[] = configured.map((profile) => ({
+    profile,
+    selected: true,
+    available: null,
+  }));
+  // Then the references not already configured — matched by id ONLY.
+  const referenceEntries: WizardEntry[] = references
+    .filter((p) => !configuredIds.has(p.id))
+    .map((profile) => ({ profile, selected: false, available: null }));
+
+  return [...configuredEntries, ...referenceEntries];
+}