diff --git a/src/components/setting/mods/layout-viewer.tsx b/src/components/setting/mods/layout-viewer.tsx
index 9769bd0d5..523913f8f 100644
--- a/src/components/setting/mods/layout-viewer.tsx
+++ b/src/components/setting/mods/layout-viewer.tsx
@@ -143,7 +143,7 @@ export const LayoutViewer = forwardRef<DialogRef>((_, ref) => {
             }
           />
           <GuardState
-            value={verge?.enable_system_titlebar}
+            value={verge?.enable_system_titlebar ?? true}
             valueProps="checked"
             onCatch={onError}
             onFormat={onSwitchFormat}