Illustrator issues with opening multiple files - Mac OS Big Sur

[#1]

I have the latest versions of Big Sur (11.0.1) and Illustrator 25.0 installed. Everytime I want to open more than one file I end up with graphic issues. It's not possible to perform any editing actions on affected tab. 

When I switch off the GPU (Radeon Pro 555X 4  GB) in Ai Preferences everything works fine.

[#2]

I have the latest versions of Big Sur (11.0.1) and Illustrator 25.0 installed. Everytime I want to open more than one file I end up with graphic issues. It's not possible to perform any editing actions on affected tab. 

When I switch off the GPU (Radeon Pro 555X 4  GB) in Ai Preferences everything works fine.