KDE has been my DE of choice for the past 4 years, but around a year ago KMail UI broke (https://i.imgur.com/eCUq4IE.png) and nothing I tried fixed it, including a complete KDE purge and reinstall.
The same issue happens on System settings>Application styles>Window decorations.
I'm on Debian testing (Bullseye), Kernel 5.4, KDE Plasma 5.14.5
Anybody has any idea why this is happening?
