diff --git a/packages/shared/src/types/instance.ts b/packages/shared/src/types/instance.ts
index 2dc7aac7994..0bb8009ca42 100644
--- a/packages/shared/src/types/instance.ts
+++ b/packages/shared/src/types/instance.ts
@@ -29,6 +29,7 @@ export interface InstanceGeneralSettings {
 export interface InstanceExperimentalSettings {
   enableEnvironments: boolean;
   enableIsolatedWorkspaces: boolean;
+  enableStreamlinedLeftNavigation: boolean;
   enableIssuePlanDecompositions: boolean;
   enableCloudSync: boolean;
   autoRestartDevServerWhenIdle: boolean;
diff --git a/packages/shared/src/validators/instance.ts b/packages/shared/src/validators/instance.ts
index beb1c8db07d..448aa107f23 100644
--- a/packages/shared/src/validators/instance.ts
+++ b/packages/shared/src/validators/instance.ts
@@ -38,6 +38,7 @@ export const patchInstanceGeneralSettingsSchema = instanceGeneralSettingsSchema.
 export const instanceExperimentalSettingsSchema = z.object({
   enableEnvironments: z.boolean().default(false),
   enableIsolatedWorkspaces: z.boolean().default(false),
+  enableStreamlinedLeftNavigation: z.boolean().default(false),
   enableIssuePlanDecompositions: z.boolean().default(false),
   enableCloudSync: z.boolean().default(false),
   autoRestartDevServerWhenIdle: z.boolean().default(false),
diff --git a/server/src/__tests__/instance-settings-service.test.ts b/server/src/__tests__/instance-settings-service.test.ts
index fbb6ea5adb9..cc4f4a235f2 100644
--- a/server/src/__tests__/instance-settings-service.test.ts
+++ b/server/src/__tests__/instance-settings-service.test.ts
@@ -15,6 +15,7 @@ describe("instance settings service", () => {
     })).toEqual({
       enableEnvironments: true,
       enableIsolatedWorkspaces: true,
+      enableStreamlinedLeftNavigation: false,
       enableIssuePlanDecompositions: true,
       enableCloudSync: true,
       autoRestartDevServerWhenIdle: true,
diff --git a/server/src/services/instance-settings.ts b/server/src/services/instance-settings.ts
index f6bdb98a9a4..e6c15745069 100644
--- a/server/src/services/instance-settings.ts
+++ b/server/src/services/instance-settings.ts
@@ -43,6 +43,7 @@ export function normalizeExperimentalSettings(raw: unknown): InstanceExperimenta
     return {
       enableEnvironments: parsed.data.enableEnvironments ?? false,
       enableIsolatedWorkspaces: parsed.data.enableIsolatedWorkspaces ?? false,
+      enableStreamlinedLeftNavigation: parsed.data.enableStreamlinedLeftNavigation ?? false,
       enableIssuePlanDecompositions: parsed.data.enableIssuePlanDecompositions ?? false,
       enableCloudSync: parsed.data.enableCloudSync ?? false,
       autoRestartDevServerWhenIdle: parsed.data.autoRestartDevServerWhenIdle ?? false,
@@ -55,6 +56,7 @@ export function normalizeExperimentalSettings(raw: unknown): InstanceExperimenta
   return {
     enableEnvironments: false,
     enableIsolatedWorkspaces: false,
+    enableStreamlinedLeftNavigation: false,
     enableIssuePlanDecompositions: false,
     enableCloudSync: false,
     autoRestartDevServerWhenIdle: false,
diff --git a/ui/src/pages/InstanceExperimentalSettings.tsx b/ui/src/pages/InstanceExperimentalSettings.tsx
index 6d9f1d72fe2..7c196ab8ef1 100644
--- a/ui/src/pages/InstanceExperimentalSettings.tsx
+++ b/ui/src/pages/InstanceExperimentalSettings.tsx
@@ -205,6 +205,8 @@ export function InstanceExperimentalSettings() {
 
   const enableEnvironments = experimentalQuery.data?.enableEnvironments === true;
   const enableIsolatedWorkspaces = experimentalQuery.data?.enableIsolatedWorkspaces === true;
+  const enableStreamlinedLeftNavigation =
+    experimentalQuery.data?.enableStreamlinedLeftNavigation === true;
   const enableIssuePlanDecompositions =
     experimentalQuery.data?.enableIssuePlanDecompositions === true;
   const enableCloudSync = experimentalQuery.data?.enableCloudSync === true;
@@ -301,6 +303,28 @@ export function InstanceExperimentalSettings() {
         </div>
       </section>
 
+      <section className="rounded-xl border border-border bg-card p-5">
+        <div className="flex items-start justify-between gap-4">
+          <div className="space-y-1.5">
+            <h2 className="text-sm font-semibold">Streamlined Left Navigation Bar</h2>
+            <p className="max-w-2xl text-sm text-muted-foreground">
+              Reduces the maximum number of items in the left navigation bar — nests Projects under Work with a
+              dedicated Projects page, and shows only active agents (max 5 recently-active) in the sidebar.
+            </p>
+          </div>
+          <ToggleSwitch
+            checked={enableStreamlinedLeftNavigation}
+            onCheckedChange={() =>
+              toggleMutation.mutate({
+                enableStreamlinedLeftNavigation: !enableStreamlinedLeftNavigation,
+              })
+            }
+            disabled={toggleMutation.isPending}
+            aria-label="Toggle streamlined left navigation experimental setting"
+          />
+        </div>
+      </section>
+
       <section className="rounded-xl border border-border bg-card p-5">
         <div className="flex items-start justify-between gap-4">
           <div className="space-y-1.5">