I tried to support multiple screen for mobile game. I found 2 totally different way of doing it.
here are these two methods:
1. Set property Fullscreen mode to "Scale outer".
2. Get property Fullscreen mode to "Letterbox Scale". Get PlatformInfo.WindowInnerWidth & PlatformInfo.WindowInnerHeight and apply it to canvas size.
By following these 2 different methods I got same desired result. But I don't know if there is any difference in both methods.