diff --git a/frontend/src/renderer/components/SessionsBoard.tsx b/frontend/src/renderer/components/SessionsBoard.tsx
index cc0a850d3..9889faac1 100644
--- a/frontend/src/renderer/components/SessionsBoard.tsx
+++ b/frontend/src/renderer/components/SessionsBoard.tsx
@@ -14,6 +14,12 @@ import { prDiffSummary, sessionPRDisplaySummaries } from "../lib/pr-display";
 import { cn } from "../lib/utils";
 import { PRAttentionPanel, PRStatusStrip } from "./PRSummaryDisplay";
 
+const isLinux =
+	typeof navigator !== "undefined" &&
+	((navigator as Navigator & { userAgentData?: { platform?: string } }).userAgentData?.platform ?? navigator.platform)
+		.toLowerCase()
+		.includes("linux");
+
 type SessionsBoardProps = {
 	/** When set, the board shows only this project's sessions. */
 	projectId?: string;
@@ -127,7 +133,7 @@ export function SessionsBoard({ projectId }: SessionsBoardProps) {
 
 	const actions = projectId ? (
 		<>
-			<NotificationCenter />
+			{isLinux ? <NotificationCenter /> : null}
 			<button
 				aria-label="New task"
 				className="dashboard-app-header__accent-btn"
@@ -148,9 +154,9 @@ export function SessionsBoard({ projectId }: SessionsBoardProps) {
 				{isSpawning ? "Spawning..." : orchestrator ? "Orchestrator" : "Spawn Orchestrator"}
 			</button>
 		</>
-	) : (
+	) : isLinux ? (
 		<NotificationCenter />
-	);
+	) : undefined;
 
 	return (
 		<div className="flex h-full min-h-0 flex-col bg-background text-foreground">
diff --git a/frontend/src/renderer/components/ShellTopbar.tsx b/frontend/src/renderer/components/ShellTopbar.tsx
index a78f2fefc..18fc8d8b2 100644
--- a/frontend/src/renderer/components/ShellTopbar.tsx
+++ b/frontend/src/renderer/components/ShellTopbar.tsx
@@ -2,6 +2,7 @@ import { useMutation, useQueryClient } from "@tanstack/react-query";
 import { useNavigate, useParams } from "@tanstack/react-router";
 import { GitBranch, LayoutDashboard, PanelRightClose, PanelRightOpen, Plus, Square, Trash2 } from "lucide-react";
 import { useState } from "react";
+import { NotificationCenter } from "./NotificationCenter";
 import {
 	findProjectOrchestrator,
 	isOrchestratorSession,
@@ -20,6 +21,11 @@ import { NewTaskDialog } from "./NewTaskDialog";
 import { cn } from "../lib/utils";
 
 const isMac = typeof navigator !== "undefined" && /Mac|iPod|iPhone|iPad/.test(navigator.userAgent);
+const isLinux =
+	typeof navigator !== "undefined" &&
+	((navigator as Navigator & { userAgentData?: { platform?: string } }).userAgentData?.platform ?? navigator.platform)
+		.toLowerCase()
+		.includes("linux");
 const dragStyle = isMac ? ({ WebkitAppRegion: "drag" } as React.CSSProperties) : undefined;
 const noDragStyle = isMac ? ({ WebkitAppRegion: "no-drag" } as React.CSSProperties) : undefined;
 
@@ -69,10 +75,12 @@ export function ShellTopbar() {
 	// removed, or data still loading) shows an empty crumb — never the raw
 	// route slug. "agent-orchestrator" is the root-board crumb only.
 	const projectId = session?.workspaceId ?? params.projectId;
-	const projectLabel = session?.workspaceName ?? "";
+	const isProjectBoardRoute = !isSessionRoute && Boolean(projectId);
+	const project = projectId ? all.find((workspace) => workspace.id === projectId) : undefined;
+	const projectLabel = project?.name ?? session?.workspaceName ?? (projectId ? "" : "agent-orchestrator");
 	const orchestrator = projectId ? findProjectOrchestrator(all, projectId) : undefined;
 
-	if (!isSessionRoute) {
+	if (isLinux && !isSessionRoute) {
 		return null;
 	}
 
@@ -133,7 +141,7 @@ export function ShellTopbar() {
 	return (
 		<header className={cn("dashboard-app-header", isMac && "is-under-titlebar-nav")} style={dragStyle}>
 			<div className="session-topbar__lead">
-				{isOrchestrator ? (
+				{isSessionRoute && isOrchestrator ? (
 					<div className="topbar-project-pills-group">
 						<div className="topbar-project-line">
 							<span className="dashboard-app-header__project">{projectLabel}</span>
@@ -146,7 +154,7 @@ export function ShellTopbar() {
 							</span>
 						</div>
 					</div>
-				) : (
+				) : isSessionRoute ? (
 					<div className="session-topbar__identity">
 						<div className="session-topbar__branch">
 							<GitBranch className="h-3 w-3 shrink-0" aria-hidden="true" />
@@ -154,13 +162,18 @@ export function ShellTopbar() {
 						</div>
 						{session ? <SessionStatusPill session={session} /> : null}
 					</div>
+				) : isProjectBoardRoute ? null : (
+					<div className="topbar-project-line">
+						<span className="dashboard-app-header__project">{projectLabel}</span>
+					</div>
 				)}
 			</div>
 
 			<div className="dashboard-app-header__spacer" />
 
 			<div className="dashboard-app-header__actions">
-				{isOrchestrator ? (
+				{!isLinux ? <NotificationCenter style={noDragStyle} /> : null}
+				{isSessionRoute && isOrchestrator ? (
 					<>
 						<button
 							aria-label="New task"
@@ -187,7 +200,7 @@ export function ShellTopbar() {
 				{/* Kill control sits beside the orchestrator link for active workers —
 				    moved here from the inspector's Summary "Danger zone". */}
 				{!isOrchestrator && session && sessionIsActive(session) ? <TopbarKillButton session={session} /> : null}
-				{!isOrchestrator && (
+				{isSessionRoute && !isOrchestrator && (
 					<button
 						aria-label="Open orchestrator"
 						className="dashboard-app-header__primary-btn dashboard-app-header__primary-btn--compact"
@@ -201,7 +214,7 @@ export function ShellTopbar() {
 					</button>
 				)}
 				{/* Inspector collapse (worker sessions only — orchestrators have no rail). */}
-				{!isOrchestrator && (
+				{isSessionRoute && !isOrchestrator && (
 					<button
 						aria-label={isInspectorOpen ? "Close inspector panel" : "Open inspector panel"}
 						aria-pressed={isInspectorOpen}
diff --git a/frontend/src/renderer/routes/_shell.tsx b/frontend/src/renderer/routes/_shell.tsx
index 8749c3245..1b2d68c6a 100644
--- a/frontend/src/renderer/routes/_shell.tsx
+++ b/frontend/src/renderer/routes/_shell.tsx
@@ -34,6 +34,12 @@ function errorMessage(error: unknown) {
 	return error instanceof Error ? error.message : "Could not load projects";
 }
 
+const isLinux =
+	typeof navigator !== "undefined" &&
+	((navigator as Navigator & { userAgentData?: { platform?: string } }).userAgentData?.platform ?? navigator.platform)
+		.toLowerCase()
+		.includes("linux");
+
 // Persistent app shell: the Sidebar + shared state survive route changes; only
 // the <Outlet> content (board / session / settings / …) swaps. Lifted out of
 // the old single <App>, with selection now owned by the router (route params)
@@ -189,7 +195,7 @@ function ShellLayout() {
 				>
 					<Sidebar
 						daemonStatus={daemonStatus}
-						underTopbar={isSessionRoute}
+						underTopbar={isLinux ? isSessionRoute : true}
 						onCreateProject={createProject}
 						onRemoveProject={removeProject}
 						workspaceError={workspaceQuery.isError ? errorMessage(workspaceQuery.error) : undefined}