Created attachment 152413 [details] evolution_title_bar SUMMARY After updating plasma to 5.25.5, GTK applications now have clickable buttons placed inside the title bar and do not offer me any option to make them behave normally like QT apps that have a lean title bar without clickable buttons that looks the same for every app. STEPS TO REPRODUCE 1. Update plasma to the latest version. 2. Launch some GTK app such as Evolution. OBSERVED RESULT Title bars have clickable buttons on them. EXPECTED RESULT Title bars should not have clickable buttons on them. SOFTWARE/OS VERSIONS Operating System: Debian GNU/Linux KDE Plasma Version: 5.25.5 KDE Frameworks Version: 5.98.0 Qt Version: 5.15.4 Kernel Version: 5.19.0-1-amd64 (64-bit) Graphics Platform: X11 Processors: 16 × AMD Ryzen 7 2700 Eight-Core Processor Memory: 15.5 GiB of RAM Graphics Processor: VEGA10 Manufacturer: Acer Product Name: Predator PH517-61 System Version: V1.09 ADDITIONAL INFORMATION
I'm afraid this is just the way the GTK apps in question operate. They ask the window manager not to draw a titlebar for them, and they take responsibility for everything. This is called "client-side decorations", or, CSDs. Evidently Evolution adopted CSDs at around the same time as you upgraded to Plasma 5.25.5, But Plasma didn't have anything to do with it; it was the app developers' decision decision. And we can't undo that in any KDE code.