https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/migrating-to-breakpoints.html#fullscreen-header-bar has some ideas, depending on whether we choose to require libadwaita 1.4 (currently 1.2)
https:/ /gnome. pages.gitlab. gnome.org/ libadwaita/ doc/main/ migrating- to-breakpoints. html#fullscreen -header- bar has some ideas, depending on whether we choose to require libadwaita 1.4 (currently 1.2)