UIWindow not filling screen for new devices?

I'm working with an old Xcode project which is roughly 7/8 years old and I've migrated it to Objective-C 2.0 and to support ARC. The project didn't support Auto-Layout (this was just before it was released) prior to me working on it. I've managed to clear up a lot of the errors/issues i was having with running it in a more modern Xcode IDE (10.2.1). For testing purposes I have implemented this code into the AppDelegate:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

self.window = [[UIWindow alloc] initWithFrame:CGRectMake(0, 0, UIScreen.mainScreen.bounds.size.width, UIScreen.mainScreen.bounds.size.height)];
[self.window setBackgroundColor:[UIColor redColor]];

self.window.rootViewController = [UIViewController new];
[self.window makeKeyAndVisible];

return YES;
}

which gives me this for some reason:

This is the result when i run on a iPhone X, iPhone XR or iPhone XS Max, it looks like the top and bottom margins (safe areas) of the screen are not being picked up on. When i debug the view hierarchy they aren't being picked up on either, it just shows the red space? When i throw this code in a new project it works fine and fills up all the space. I'm wondering that because this is a old project there might be a build setting which is restricting the UIWindow from expanding to allow support for new devices?

Also as a side note I've made sure the UIWindow object isn't being manipulated elsewhere.

Try to add "Launch screen interface file base name" (UILaunchStoryboardName) to your Info.plist

It seems that the presence of this key tells the system that you natively support new device types and size classes, so your window can fill all available area.