Assistive touch gaming horizontal on iPhone 16

I use a Bluetooth mouse with Assistive touch on my iPhone 16 plus ios 18.

The mouse pointer works fine in both vertical and horizontal mode. When I play games It works fine in vertical mode as well, but when games are in horizontal mode I'm only able to move the pointer on the left side of the screen. I can only use the mouse pointer half of the screen so to speak. I hope there is someone out there who can help me, thank you :).