diff --git a/packages/studio/src/components/editor/manualEditingAvailability.test.ts b/packages/studio/src/components/editor/manualEditingAvailability.test.ts
index 2b36fe640..5bc29cc43 100644
--- a/packages/studio/src/components/editor/manualEditingAvailability.test.ts
+++ b/packages/studio/src/components/editor/manualEditingAvailability.test.ts
@@ -106,13 +106,13 @@ describe("manual editing availability", () => {
     expect(resolveStudioBooleanEnvFlag({ UNKNOWN: "maybe" }, ["UNKNOWN"], false)).toBe(false);
   });
 
-  it("defaults the flat inspector flag to false and honors an explicit override", async () => {
-    const off = await loadAvailabilityWithEnv({});
-    expect(off.STUDIO_FLAT_INSPECTOR_ENABLED).toBe(false);
-
-    const on = await loadAvailabilityWithEnv({
-      VITE_STUDIO_FLAT_INSPECTOR_ENABLED: "true",
-    });
+  it("defaults the flat inspector flag to true and honors an explicit override", async () => {
+    const on = await loadAvailabilityWithEnv({});
     expect(on.STUDIO_FLAT_INSPECTOR_ENABLED).toBe(true);
+
+    const off = await loadAvailabilityWithEnv({
+      VITE_STUDIO_FLAT_INSPECTOR_ENABLED: "false",
+    });
+    expect(off.STUDIO_FLAT_INSPECTOR_ENABLED).toBe(false);
   });
 });
diff --git a/packages/studio/src/components/editor/manualEditingAvailability.ts b/packages/studio/src/components/editor/manualEditingAvailability.ts
index 5a9c80234..5e6f4213f 100644
--- a/packages/studio/src/components/editor/manualEditingAvailability.ts
+++ b/packages/studio/src/components/editor/manualEditingAvailability.ts
@@ -98,12 +98,14 @@ export const STUDIO_SDK_RESOLVER_SHADOW_ENABLED = resolveStudioBooleanEnvFlag(
 );
 
 // Studio inspector redesign ("Ledger, flat" — design_handoff_studio_inspector):
-// flat identity header/footer/groups behind a flag for incremental review.
-// Default false; enable via VITE_STUDIO_FLAT_INSPECTOR_ENABLED=true.
+// flat identity header/footer/groups. Default true as of v0.7.59+ bug-fix pass
+// (right-aligned values, Stroke select-only, promote-badge overlap, Layout/
+// Style section gating); disable via VITE_STUDIO_FLAT_INSPECTOR_ENABLED=false
+// to fall back to the legacy panel.
 export const STUDIO_FLAT_INSPECTOR_ENABLED = resolveStudioBooleanEnvFlag(
   env,
   ["VITE_STUDIO_ENABLE_FLAT_INSPECTOR", "VITE_STUDIO_FLAT_INSPECTOR_ENABLED"],
-  false,
+  true,
 );
 
 export const STUDIO_MANUAL_EDITING_DISABLED_TITLE = "Manual editing is temporarily disabled";
diff --git a/packages/studio/src/components/editor/propertyPanelInputCoverage.test.tsx b/packages/studio/src/components/editor/propertyPanelInputCoverage.test.tsx
index 808680bc7..822223047 100644
--- a/packages/studio/src/components/editor/propertyPanelInputCoverage.test.tsx
+++ b/packages/studio/src/components/editor/propertyPanelInputCoverage.test.tsx
@@ -455,6 +455,13 @@ function representativeElement() {
 
 describe("classic PropertyPanel input coverage", () => {
   it("emits only named, known-section events across body inputs and header/footer chrome", async () => {
+    vi.resetModules();
+    vi.doMock("./manualEditingAvailability", async () => {
+      const actual = await vi.importActual<typeof import("./manualEditingAvailability")>(
+        "./manualEditingAvailability",
+      );
+      return { ...actual, STUDIO_FLAT_INSPECTOR_ENABLED: false };
+    });
     const { PropertyPanel } = await import("./PropertyPanel");
     const host = render(
       <PropertyPanel