qt5 applications look like this
(i dont have permission to post links)
i tried to log in with another user and the applications look fine there.
i think this a problem with my configuration but i don’t know where to change it
Moved to #desktop-environments:Gnome as is not a #support:general issue.
Please make sure you use Kvantum as Qt5 decoration and not gtk2. Probably the Qt5Settings is set to it and some gtk2 themes do not render properly …
There was a thread on the old forum with many recommendations to give a good look at Qt apps under Gnome, but I think it has been lost.
You have to install Kvantum, choose a theme, then set
as global environment variables at startup.
Maybe there were also other things, but I don’t remember now.