I received help with the answer to the first question, a person helped me, here is the source code, thanks to which you can fix the game window in the center of the screen.
X - PlatformInfo.ScreenWidth/2-PlatformInfo.WindowOuterWidth/2
Y - PlatformInfo.ScreenHeight/2-PlatformInfo.WindowOuterHeight/2
Text - PlatformInfo.ScreenHeight&" : "&PlatformInfo.ScreenWidth&newline&newline&
PlatformInfo.WindowOuterHeight&" : "&PlatformInfo.WindowOuterWidth&newline&newline&
PlatformInfo.ScreenHeight/2-PlatformInfo.WindowOuterHeight/2&" : "&
PlatformInfo.ScreenWidth/2-PlatformInfo.WindowOuterWidth/2