You must provide custom visual resources to the Apple Game Center for its native leaderboard UI. Here’s how to set them up in Xcode:
Open the Input window in the Unity Editor. Find the first occurrence of the Submit virtual input, expand it, and change its Alt Positive Button to joystick button 14.
Select the EventSystem appObject in your Scene. In the Inspector, find the EventSystem component, and set a reference to the UI appObject that should receive initial focus in the First Selected property. You might need to enable the Force input module property in the Standalone Input Module component.
Note: Apple TV Remote navigation doesn’t work while your app is running in the TV Simulator.