OSX Big Sur Window UI turns purple when moved to desktop two

Solution 1:

Same issue here. Filed a bug report to apple. Specially XCode looks annoying .... but only when shown in fullscreen or on a second desktop. The main desktop is fine.

I worked around it by:

System Preferences -> General -> DISABLE: "Allow wallpaper tinting in windows"

Solution 2:

Same Issue. It seems Big Sur has an error when creating the 2nd desktop. It also turns white all the icons and text in the upper bar.

If you create 3 or more desktops, and move the window to any one except 2d it doesn't show a purple window. Even when you close the 2d desktop.

Work around:

1. Create 3 desktops
2. Move your window to the 3rd one
3. Delete 2d desktop