How it shall look… # Linux & BSDs # Windows # macOS # State on Fedora 40 Workstation & XFCE Spin… # Screenshots taken from the GNOME bugtracker, copies to not stall their GitLab instance.
It's GTK4, libadwaita is just their really weird theming stuff, but the UI toolkit is still called GTK, and version 4 of it forces you to use libadwaita. You can't change the theme, because Gnome is actually user-hostile.