env vaiables for wayland can stored in /etc/environment
dolphin
QT_QPA_PLATFORMTHEME=qt5ct dolphin
https://wiki.archlinux.org/title/qt (topic 3.5)
GTK_THEME=Adwaita:dark libreoffice
so GTK_THEME=Adwaita:dark as env variable will make libreoffice and other gtk applications to use proper gtk theme https://wiki.archlinux.org/title/GTK#Themes
https://wiki.archlinux.org/title/Uniform_look_for_Qt_and_GTK_applications#Qt_applications_run_on_GNOME_Wayland_have_a_non-matching_window_decoration_look,_even_after_setting_a_Qt_theme In order to have a matching window decoration look, you have to install qgnomeplatform-qt5, and set the following environment variable: QT_QPA_PLATFORMTHEME='gnome' This fix is guaranteed to work with Adwaita or Adwaita-dark.