That looks like no fun.
I’m on Win 7 with Nvidia GPU pushing 3 different monitors, all at different resolutions. Everything is at default settings, in terms of desktop/GPU/monitors.
I’ve attached pics of a 65" 4K and a 27" Dell touchscreen, both showing mixers. All looks as it should.
Can you post all your system specs, please, if you have not. Vital info for getting help with this issue.