When I set Classic theme for message list, KMail doesn't preserve the width of message list columns, after every launch columns width is reset. Operating System: Manjaro Linux KDE Plasma Version: 5.21.3 KDE Frameworks Version: 5.80.0 Qt Version: 5.15.2 Kernel Version: 5.4.105-1-MANJARO OS Type: 64-bit Graphics Platform: X11
The same happens also with smart theme.