@ChristianWS And yes, this is only the current, very early state. Libdecor is will have theming support to have an option to look “system design native” (Blender) and for Gimp, this is experimental on an pre-release. Qt on the other hand, I assume, probably doesnt care right now, because the apps that use Qt and matter come with an own design language and own CSD anyways and everything else is probably not worth the work for basically linux wayland only.