diff --git a/apps/presentation/dashboard/docs/assets/goal-hierarchy/invalid-root-desktop.png b/apps/presentation/dashboard/docs/assets/goal-hierarchy/invalid-root-desktop.png
index ae31fa3a2e..d8072d34ad 100644
Binary files a/apps/presentation/dashboard/docs/assets/goal-hierarchy/invalid-root-desktop.png and b/apps/presentation/dashboard/docs/assets/goal-hierarchy/invalid-root-desktop.png differ
diff --git a/apps/presentation/dashboard/docs/assets/goal-hierarchy/invalid-root-phone.png b/apps/presentation/dashboard/docs/assets/goal-hierarchy/invalid-root-phone.png
index 491e4ab4ad..70bf6ecd7c 100644
Binary files a/apps/presentation/dashboard/docs/assets/goal-hierarchy/invalid-root-phone.png and b/apps/presentation/dashboard/docs/assets/goal-hierarchy/invalid-root-phone.png differ
diff --git a/apps/presentation/dashboard/src/features/personal-workspace/channel-header.tsx b/apps/presentation/dashboard/src/features/personal-workspace/channel-header.tsx
index 6e87e5264b..e8f265ef31 100644
--- a/apps/presentation/dashboard/src/features/personal-workspace/channel-header.tsx
+++ b/apps/presentation/dashboard/src/features/personal-workspace/channel-header.tsx
@@ -41,6 +41,7 @@ export function ChannelHeader({
   selectedAgentReasoningEffort,
   selectedGoal,
   selectedGoalTab,
+  scopeUnavailable = false,
   workspaceGrantLabel,
 }: {
   agents: WorkspaceAgentOption[];
@@ -81,6 +82,8 @@ export function ChannelHeader({
   selectedAgentReasoningEffort?: string;
   selectedGoal: WorkspaceGoal | null;
   selectedGoalTab: WorkspaceGoalTab;
+  /** A requested Goal scope failed; do not present the steward as its fallback. */
+  scopeUnavailable?: boolean;
 }) {
   const { locale, t } = useWorkspaceI18n();
   const statusOnly = selectedAgentId === "status-only";
@@ -154,7 +157,7 @@ export function ChannelHeader({
                   : "header.managerAllocationConfigured")
     : null;
 
-  const runtimeControl = agentWorkActive ? null : readOnlySourceLabel ? (
+  const runtimeControl = scopeUnavailable || agentWorkActive ? null : readOnlySourceLabel ? (
     <span className="personal-read-only-source" title={t("header.readOnlySourceDescription", { source: readOnlySourceLabel })}><Eye size={15} />{readOnlySourceLabel}<small>{t("common.readOnly")}</small></span>
   ) : <>
     <WorkspaceSelect
@@ -197,8 +200,8 @@ export function ChannelHeader({
 
   // The steward channel binding describes the steward executor; a workspace
   // conversation runs on the selected runtime instead.
-  const stewardBindingVisible = !selectedGoal && !workspaceGrantLabel;
-  const scopeControl = !selectedGoal && managerChatOpen && conversationScope && !readOnlySourceLabel ? (
+  const stewardBindingVisible = !scopeUnavailable && !selectedGoal && !workspaceGrantLabel;
+  const scopeControl = !scopeUnavailable && !selectedGoal && managerChatOpen && conversationScope && !readOnlySourceLabel ? (
     <WorkspaceSelect
       ariaLabel={t("header.conversationScope")}
       className="personal-agent-select personal-scope-select"
@@ -214,7 +217,7 @@ export function ChannelHeader({
     <header className="personal-channel-header" data-goal-selected={Boolean(selectedGoal)} data-workspace-scope={workspaceGrantLabel ? "true" : undefined}>
       <button aria-expanded={mobileNavigationOpen ?? false} aria-label={t("header.openGoalNavigation")} className="personal-icon-button personal-mobile-menu" onClick={onOpenNavigation} type="button"><Menu size={18} /></button>
       <div className="personal-channel-title">
-        {selectedGoal ? <GoalMastheadIdentity goal={selectedGoal} onOpenDetails={onOpenGoalDetails} onOpenWorkspace={onOpenWorkspace ?? (() => undefined)} /> : <h1>{t("header.manager")}</h1>}
+        {selectedGoal ? <GoalMastheadIdentity goal={selectedGoal} onOpenDetails={onOpenGoalDetails} onOpenWorkspace={onOpenWorkspace ?? (() => undefined)} /> : <h1>{t(scopeUnavailable ? "header.goalView" : "header.manager")}</h1>}
         {workspaceGrantLabel ? <p className="personal-channel-activity">{t("workspace.conversation", { grant: workspaceGrantLabel })}</p> : null}
         <div className="personal-manager-context">
         {stewardBindingVisible && managerChannelBinding ? (
@@ -269,12 +272,12 @@ export function ChannelHeader({
         </nav>
         {runtimeControl}
         </div>
-      ) : (
+      ) : !scopeUnavailable ? (
         <nav aria-label={t("header.managerView")} className="personal-goal-tabs">
           <button aria-current={!managerChatOpen ? "page" : undefined} onClick={onReturnManagerHome} type="button">{t("header.managerOverview")}</button>
           <button aria-current={managerChatOpen ? "page" : undefined} onClick={onOpenManagerChat} type="button">{t("header.chat")}</button>
         </nav>
-      )}
+      ) : null}
       <div className="personal-channel-actions">
         {selectedGoal && onOpenAllWork ? <button type="button" className="personal-icon-button goal-all-work-trigger" aria-label={locale === "zh-CN" ? "打开全部工作" : "Open all work"} aria-expanded={allWorkOpen} aria-haspopup="dialog" onClick={onOpenAllWork}><List size={17} aria-hidden/></button> : null}
         {selectedGoal && !selectedGoal.loadState && onRequestGoalLifecycle ? (
diff --git a/apps/presentation/dashboard/src/features/personal-workspace/personal-workspace-page.tsx b/apps/presentation/dashboard/src/features/personal-workspace/personal-workspace-page.tsx
index cd150d66f3..4ca24870ce 100644
--- a/apps/presentation/dashboard/src/features/personal-workspace/personal-workspace-page.tsx
+++ b/apps/presentation/dashboard/src/features/personal-workspace/personal-workspace-page.tsx
@@ -2674,6 +2674,7 @@ export function PersonalWorkspacePage({
           <div>
           <ChannelHeader
             agents={agents}
+            scopeUnavailable={rootUnavailable}
             agentWorkActive={agentWorkActive}
             conversationScope={workspaceConversations && (workspaceConversations.projects?.length || workspaceConversations.readFailed || selectedWorkspaceRef) ? {
               onChange: (value) => {
diff --git a/examples/personal-workspace-browser/goal-hierarchy.mjs b/examples/personal-workspace-browser/goal-hierarchy.mjs
index e75b910e41..da17eb4962 100644
--- a/examples/personal-workspace-browser/goal-hierarchy.mjs
+++ b/examples/personal-workspace-browser/goal-hierarchy.mjs
@@ -117,6 +117,9 @@ export const goalHierarchyScenario = {
       assert.equal(await page.getByTestId("personal-first-goal").count(), 0);
       assert.equal(await page.locator(".personal-manager-greeting, .personal-composer-wrap").count(), 0,
         "An unavailable research root must not open an unrelated steward conversation");
+      assert.equal(await page.getByRole("navigation", {name: "管家视图", exact: true}).count(), 0,
+        "An unavailable research root cannot offer unrelated steward navigation");
+      assert.notEqual(await page.locator(".personal-channel-title h1").textContent(), "LoopX 管家");
       unavailable.searchParams.set("rootGoalId", "../missing");
       await page.goto(unavailable.href, {waitUntil: "networkidle"});
       await page.getByRole("alert").filter({hasText: "当前来源中此 Goal 范围不可用"}).waitFor();
@@ -128,6 +131,8 @@ export const goalHierarchyScenario = {
         await page.getByRole("alert").filter({hasText: "当前来源中此 Goal 范围不可用"}).waitFor();
         assert.equal(await page.locator(".personal-goal-row").count(), 0, `${invalid}: decoded values cannot widen the scope`);
         assert.equal(await page.locator(".personal-manager-greeting, .personal-composer-wrap").count(), 0);
+        assert.equal(await page.getByRole("navigation", {name: "管家视图", exact: true}).count(), 0);
+        assert.notEqual(await page.locator(".personal-channel-title h1").textContent(), "LoopX 管家");
         await page.getByRole("button", {name: "全部 Goals", exact: true}).click();
         await row("daily").waitFor();
         await page.goBack({waitUntil: "networkidle"});