diff --git a/docs/dashboard-guide.md b/docs/dashboard-guide.md
index cabcf5e385..980afeb232 100644
--- a/docs/dashboard-guide.md
+++ b/docs/dashboard-guide.md
@@ -334,7 +334,7 @@ Mailbox view shows inbox/outbox communication threads and unread state.
 - reply rows in the mailbox modal can expand inline to show the replied-to message context for easier thread reading
 - mailbox now includes an **Approvals** tab with pending and history filters (`approved` / `denied` / `completed`), approval detail context, and inline approve/deny actions for pending requests
 - in the **Agents** tab, the agent selector now includes **All agents**, which shows one combined agent-to-agent stream (with sender + recipient labels); selecting a specific agent still shows Inbox/Outbox subtabs
-- mailbox entry points now show unread/pending indicators: the desktop Header mailbox toggle shows a pending-approval dot first or an unread dot when unread mail exists without pending approvals, while Header overflow + Mobile mailbox entry points continue to surface mailbox badges/dots
+- mailbox entry points now show unread/pending indicators: the desktop/tablet Header mailbox toggle shows a pending-approval dot first or an unread dot when unread mail exists without pending approvals, the mobile bottom-nav Mailbox tab carries the mobile badges/dots, and the compact Header actions overflow keeps a Mailbox entry only when the mobile bottom nav is disabled
 - approval lifecycle SSE events (`approval:requested`, `approval:updated`, `approval:decided`) trigger mailbox approvals refresh without manual reload
 - when a task newly enters `awaiting-approval`, the app shows a persistent approval banner above project content with an **Open Mailbox** CTA; dismissals are remembered per approval item until that item advances or a different one arrives
 - when a task first transitions into `done`, the dashboard shows a one-time **Enjoying Fusion?** GitHub star prompt in the project view; clicking **Star on GitHub** or dismissing the card marks it shown in browser `localStorage`, so it does not reappear on reload or later task completions
diff --git a/packages/dashboard/app/__tests__/mobile-feature-access-regression.test.tsx b/packages/dashboard/app/__tests__/mobile-feature-access-regression.test.tsx
index 287f631721..0de36fc6db 100644
--- a/packages/dashboard/app/__tests__/mobile-feature-access-regression.test.tsx
+++ b/packages/dashboard/app/__tests__/mobile-feature-access-regression.test.tsx
@@ -170,7 +170,8 @@ describe("Mobile Feature Access Regression Guard", () => {
 
     fireEvent.click(screen.getByTestId("mobile-nav-tab-more"));
 
-    expect(screen.getByTestId("mobile-more-item-mailbox")).toBeDefined();
+    expect(screen.getByTestId("mobile-nav-tab-mailbox")).toBeDefined();
+    expect(screen.queryByTestId("mobile-more-item-mailbox")).toBeNull();
     expect(screen.getByTestId("mobile-more-item-git")).toBeDefined();
     expect(screen.getByTestId("mobile-more-item-terminal")).toBeDefined();
     expect(screen.getByTestId("mobile-more-item-files")).toBeDefined();
diff --git a/packages/dashboard/app/components/MobileNavBar.tsx b/packages/dashboard/app/components/MobileNavBar.tsx
index 37a1ad317b..30a6cd049f 100644
--- a/packages/dashboard/app/components/MobileNavBar.tsx
+++ b/packages/dashboard/app/components/MobileNavBar.tsx
@@ -138,7 +138,6 @@ export function MobileNavBar({
   keyboardOpen = false,
   onOpenSettings,
   onOpenActivityLog,
-  onOpenMailbox,
   mailboxUnreadCount = 0,
   mailboxPendingApprovalCount = 0,
   chatHasUnreadResponse = false,
@@ -375,6 +374,11 @@ export function MobileNavBar({
         </button>
 
 
+        {/*
+        FNXC:Navigation 2026-06-19-12:30:
+        Mailbox is a top-level mobile tab only and must not be duplicated in the three-dot More sheet; Todos lives only in the three-dot overflow/More menu, never the main tab list.
+        Keep unread and pending-approval indicators on this surviving Mailbox tab so removing the More-sheet duplicate does not hide mailbox state.
+        */}
         <button
           type="button"
           className={`mobile-nav-tab${view === "mailbox" ? " mobile-nav-tab--active" : ""}`}
@@ -470,22 +474,6 @@ export function MobileNavBar({
               </div>
             ) : null}
 
-            <button
-              type="button"
-              className="mobile-more-item"
-              data-testid="mobile-more-item-mailbox"
-              onClick={() => handleMoreAction(onOpenMailbox)}
-            >
-              <Mail />
-              <span>{t("nav.mailbox", "Mailbox")}</span>
-              {mailboxUnreadCount > 0 && (
-                <span className="mobile-more-item-badge mobile-more-item-badge--unread">{formatCount(mailboxUnreadCount)}</span>
-              )}
-              {mailboxPendingApprovalCount > 0 && (
-                <span className="mobile-more-item-badge">{formatCount(mailboxPendingApprovalCount)}</span>
-              )}
-            </button>
-
             <button
               type="button"
               className="mobile-more-item"
diff --git a/packages/dashboard/app/components/__tests__/Header.test.tsx b/packages/dashboard/app/components/__tests__/Header.test.tsx
index 7bff7bac53..60af6f511b 100644
--- a/packages/dashboard/app/components/__tests__/Header.test.tsx
+++ b/packages/dashboard/app/components/__tests__/Header.test.tsx
@@ -540,14 +540,19 @@ describe("Header", () => {
   });
 
   describe("todos navigation", () => {
-    it("shows Todos only in More views on desktop when enabled", () => {
-      renderHeader({ onChangeView: noop, onOpenTodos: vi.fn(), todosEnabled: true }, "desktop");
-      expect(screen.queryByTestId("todos-toggle-btn")).toBeNull();
+    for (const tier of ["desktop", "tablet"] as const) {
+      it(`shows Todos only in More views and Mailbox only top-level on ${tier}`, () => {
+        renderHeader({ onChangeView: noop, onOpenTodos: vi.fn(), todosEnabled: true }, tier);
 
-      fireEvent.click(screen.getByTestId("view-toggle-overflow-trigger"));
-      expect(screen.getAllByText("Todos")).toHaveLength(1);
-      expect(screen.getByTestId("view-overflow-todos")).toBeInTheDocument();
-    });
+        expect(screen.queryByTestId("todos-toggle-btn")).toBeNull();
+        expect(screen.getByTitle("Mailbox view")).toBeInTheDocument();
+
+        fireEvent.click(screen.getByTestId("view-toggle-overflow-trigger"));
+        expect(screen.getAllByText("Todos")).toHaveLength(1);
+        expect(screen.getByTestId("view-overflow-todos")).toBeInTheDocument();
+        expect(screen.queryByTestId("view-overflow-mailbox")).toBeNull();
+      });
+    }
 
     it("does not show Todos entry in More views when disabled", () => {
       renderHeader({ onChangeView: noop, onOpenTodos: vi.fn(), todosEnabled: false }, "desktop");
diff --git a/packages/dashboard/app/components/__tests__/MobileNavBar.test.tsx b/packages/dashboard/app/components/__tests__/MobileNavBar.test.tsx
index 7f13be9e3f..eb9da10526 100644
--- a/packages/dashboard/app/components/__tests__/MobileNavBar.test.tsx
+++ b/packages/dashboard/app/components/__tests__/MobileNavBar.test.tsx
@@ -121,6 +121,30 @@ describe("MobileNavBar", () => {
     expect(onOpenTodos).toHaveBeenCalled();
   });
 
+  it("Mailbox is a primary tab and is not duplicated in the More sheet", () => {
+    render(<MobileNavBar {...createDefaultProps()} mailboxUnreadCount={3} mailboxPendingApprovalCount={1} />);
+
+    expect(screen.getByTestId("mobile-nav-tab-mailbox")).toBeInTheDocument();
+
+    fireEvent.click(screen.getByTestId("mobile-nav-tab-more"));
+    expect(screen.queryByTestId("mobile-more-item-mailbox")).toBeNull();
+  });
+
+  it("Todos lives only in the More sheet, never a primary tab", () => {
+    render(
+      <MobileNavBar
+        {...createDefaultProps()}
+        onOpenTodos={vi.fn()}
+        experimentalFeatures={{ todoView: true }}
+      />,
+    );
+
+    expect(screen.queryByTestId("mobile-nav-tab-todos")).toBeNull();
+
+    fireEvent.click(screen.getByTestId("mobile-nav-tab-more"));
+    expect(screen.getByTestId("mobile-more-item-todos")).toBeInTheDocument();
+  });
+
   it("shows secrets in More and routes to secrets view", () => {
     const props = createDefaultProps();
     render(<MobileNavBar {...props} />);
@@ -304,15 +328,15 @@ describe("MobileNavBar", () => {
     expect(badge?.textContent).toBe("5");
   });
 
-  it("shows matching mailbox unread badge in the More sheet", () => {
+  it("keeps mailbox unread badge on the primary tab only", () => {
     render(<MobileNavBar {...createDefaultProps()} mailboxUnreadCount={7} />);
 
-    fireEvent.click(screen.getByTestId("mobile-nav-tab-more"));
+    const tabBadge = screen.getByTestId("mobile-nav-tab-mailbox").querySelector(".mobile-nav-tab-badge");
+    expect(tabBadge).toBeDefined();
+    expect(tabBadge?.textContent).toBe("7");
 
-    const moreItemBadge = screen.getByTestId("mobile-more-item-mailbox").querySelector(".mobile-more-item-badge");
-    expect(moreItemBadge).toBeDefined();
-    expect(moreItemBadge?.className).toContain("mobile-more-item-badge--unread");
-    expect(moreItemBadge?.textContent).toBe("7");
+    fireEvent.click(screen.getByTestId("mobile-nav-tab-more"));
+    expect(screen.queryByTestId("mobile-more-item-mailbox")).toBeNull();
   });
 
   it("tasks tab calls onChangeView with 'board' when coming from a non-tasks view", () => {
@@ -423,7 +447,8 @@ describe("MobileNavBar", () => {
     render(<MobileNavBar {...createDefaultProps()} />);
     fireEvent.click(screen.getByTestId("mobile-nav-tab-more"));
 
-    expect(screen.getByTestId("mobile-more-item-mailbox")).toBeDefined();
+    expect(screen.queryByTestId("mobile-more-item-mailbox")).toBeNull();
+    expect(screen.getByTestId("mobile-nav-tab-mailbox")).toBeDefined();
     expect(screen.getByTestId("mobile-more-item-activity")).toBeDefined();
     expect(screen.getByTestId("mobile-more-item-git")).toBeDefined();
     expect(screen.getByTestId("mobile-more-item-terminal")).toBeDefined();