diff --git a/packages/react-native/React/Base/RCTUtils.mm b/packages/react-native/React/Base/RCTUtils.mm
index 4a0e1ca40b6b..1ad5afb525c1 100644
--- a/packages/react-native/React/Base/RCTUtils.mm
+++ b/packages/react-native/React/Base/RCTUtils.mm
@@ -384,13 +384,13 @@ UIDeviceOrientation RCTDeviceOrientation(void)
 CGSize RCTScreenSize(void)
 {
   static CGSize portraitSize;
-  static dispatch_once_t onceToken;
-  dispatch_once(&onceToken, ^{
+
+  if (CGSizeEqualToSize(portraitSize, CGSizeZero)) {
     RCTUnsafeExecuteOnMainQueueSync(^{
       CGSize screenSize = [UIScreen mainScreen].bounds.size;
       portraitSize = CGSizeMake(MIN(screenSize.width, screenSize.height), MAX(screenSize.width, screenSize.height));
     });
-  });
+  }
 
 #if !TARGET_OS_TV
   if (UIDeviceOrientationIsLandscape(RCTDeviceOrientation())) {
diff --git a/packages/react-native/React/CoreModules/RCTAlertController.mm b/packages/react-native/React/CoreModules/RCTAlertController.mm
index b275ebc5c67e..e8b13f071798 100644
--- a/packages/react-native/React/CoreModules/RCTAlertController.mm
+++ b/packages/react-native/React/CoreModules/RCTAlertController.mm
@@ -23,6 +23,7 @@ - (UIWindow *)alertWindow
     UIWindowScene *scene = RCTKeyWindow().windowScene;
     if (scene != nil) {
       _alertWindow = [[UIWindow alloc] initWithWindowScene:scene];
+      _alertWindow.frame = scene.coordinateSpace.bounds;
     } else {
       _alertWindow = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];
     }