Black bars on both sides of screen

[Suutefan]

I'm on a Galaxy S21(Snapdragon 888,Adreno 660) and the game runs pretty good
But I have constant black bars on the sides of the screen
Idk if this is normal but the stretch UI option in setting doesn't change anything so I thought it might be glitched

[zqpvr]

@claude @SansNope need this fixed