Full Screen on rounded corners devices? (ex: LG G6, Mi Mix)

I have noticed that my games don´t run full screen on my Mi Mix, the game doesn´t use the rounded corners, creating a black bar at the bottom and at the top of the screen, there is a way to fix that?

*It´s probably not a problem whit the phone, because other games run´s full screen normaly.

What scaling are you using? Letterbox? Do you still get the black bars if you set it to scale outer or scale inner?

I apologise for the late reply, but it fixed the problem, thanks!