Hello !
I recently deleted my /etc by mistake. I reinstalled my system. My /home was left intact as it is on a second SSD so I mount this SSD on /home. This means all my config files and everything were left untouched.
I say that in case this is important for solving the issue.
Now when I try to add a window rule in System Settings > Window Management > Window Rule > Add, I can’t see the dropdowns values.
I see the values in the dropdown in Keyboard for example or the one in Mouse & Touchpad.
I tried changing themes but this didn’t solve it.
Here are the screenshot of the bug :
One more precision, there is an item which preselect everything (every line are colored blue) when I hover it and others only highlight themselves.
Thanks for the useful help !