diff --git a/frontend/package.json.md5 b/frontend/package.json.md5
index bed8925..7396e24 100755
--- a/frontend/package.json.md5
+++ b/frontend/package.json.md5
@@ -1 +1 @@
-0295a42fd931778d85157816d79d29e5
\ No newline at end of file
+d0464f9da25e9356e61652e638c99ffe
\ No newline at end of file
diff --git a/frontend/src/store.test.ts b/frontend/src/store.test.ts
index 20cd84d..f4323a2 100644
--- a/frontend/src/store.test.ts
+++ b/frontend/src/store.test.ts
@@ -1062,6 +1062,19 @@ describe('store appearance persistence', () => {
     });
   });
 
+  it('persists startup fullscreen immediately so next launch does not miss maximize preference', async () => {
+    const { useStore } = await importStore();
+
+    useStore.getState().setStartupFullscreen(true);
+
+    const persisted = JSON.parse(storage.getItem('lite-db-storage') || '{}');
+    expect(persisted.state.startupFullscreen).toBe(true);
+
+    vi.resetModules();
+    const reloaded = await importStore();
+    expect(reloaded.useStore.getState().startupFullscreen).toBe(true);
+  });
+
   it('falls back to Enter when persisted AI chat send shortcut is invalid', async () => {
     storage.setItem('lite-db-storage', JSON.stringify({
       state: {
diff --git a/frontend/src/store.ts b/frontend/src/store.ts
index 328210b..8d9c59c 100644
--- a/frontend/src/store.ts
+++ b/frontend/src/store.ts
@@ -225,6 +225,36 @@ const createDebouncedPersistStorage = <S>(
   };
 };
 
+const writePersistedStatePatch = (
+  patch: Record<string, unknown>,
+): void => {
+  if (typeof localStorage === "undefined") {
+    return;
+  }
+  try {
+    const payload = localStorage.getItem(PERSIST_STORAGE_KEY);
+    const raw =
+      payload && payload.trim() !== ""
+        ? (JSON.parse(payload) as Record<string, unknown>)
+        : {};
+    const state = unwrapPersistedAppState(raw);
+    localStorage.setItem(
+      PERSIST_STORAGE_KEY,
+      JSON.stringify({
+        ...raw,
+        state: {
+          ...state,
+          ...patch,
+        },
+        version:
+          typeof raw.version === "number" ? raw.version : PERSIST_VERSION,
+      }),
+    );
+  } catch {
+    // ignore
+  }
+};
+
 const resolveOceanBaseProtocol = (
   raw: Record<string, unknown>,
   normalizedConnectionParams: string,
@@ -2654,7 +2684,11 @@ export const useStore = create<AppState>()(
         })),
       setUiScale: (scale) => set({ uiScale: sanitizeUiScale(scale) }),
       setFontSize: (size) => set({ fontSize: sanitizeFontSize(size) }),
-      setStartupFullscreen: (enabled) => set({ startupFullscreen: !!enabled }),
+      setStartupFullscreen: (enabled) => {
+        const nextValue = !!enabled;
+        set({ startupFullscreen: nextValue });
+        writePersistedStatePatch({ startupFullscreen: nextValue });
+      },
       setGlobalProxy: (proxy) =>
         set((state) => ({
           globalProxy: sanitizeGlobalProxy({ ...state.globalProxy, ...proxy }),