diff --git a/src/state/AppState.ts b/src/state/AppState.ts
index 69975e9e..9dcde3ca 100644
--- a/src/state/AppState.ts
+++ b/src/state/AppState.ts
@@ -39,6 +39,9 @@ export interface AppStateContext {
   setShouldDebugImageFallbacks?: Dispatch<SetStateAction<boolean>>
   shouldShowBaselineGrid?: boolean
   setShouldShowBaselineGrid?: Dispatch<SetStateAction<boolean>>
+  // FULLSCREEN
+  isFullscreen?: boolean
+  setIsFullscreen?: Dispatch<SetStateAction<boolean>>
 }
 
 export const AppStateContext = createContext<AppStateContext>({});
diff --git a/src/state/AppStateProvider.tsx b/src/state/AppStateProvider.tsx
index 8a8f1da8..5e527c74 100644
--- a/src/state/AppStateProvider.tsx
+++ b/src/state/AppStateProvider.tsx
@@ -52,6 +52,9 @@ export default function AppStateProvider({
     useState(false);
   const [shouldShowBaselineGrid, setShouldShowBaselineGrid] =
     useState(false);
+  // FULLSCREEN
+  const [isFullscreen, setIsFullscreen] =
+    useState(false);
 
   const invalidateSwr = useCallback(() => setSwrTimestamp(Date.now()), []);
 
@@ -120,6 +123,9 @@ export default function AppStateProvider({
         setShouldDebugImageFallbacks,
         shouldShowBaselineGrid,
         setShouldShowBaselineGrid,
+        // FULLSCREEN
+        isFullscreen,
+        setIsFullscreen,
       }}
     >
       {children}