Kamil Cynk

https://github.com/NixOS/nixpkgs/issues/266858

> Did you reboot after setting the envvar and rebuilding? Yes, looks like all app in calibre package are affected 

Problem still exist even with this options ``` environment.sessionVariables = { CALIBRE_USE_SYSTEM_THEME = "true"; QT_STYLE_OVERRIDE = "adwaita"; QT_WAYLAND_DECORATION = "adwaita"; QT_QPA_PLATFORMTHEME = "gnome"; QT_QPA_PLATFORM = "wayland"; }; ```

Problem still exists (.rpm) package works but i prefer have all software as flatpat (Fedora Silverblue)