for GNOME 46, and apps that have been ported to Adwaita 1.5 dialogs, it wont be possible to use the "attach-modal-dialogs" property of Mutter for de-attaching modal dialogs..at the moment; supplementary content for this.. https://www.youtube.com/watch?v=lyjFj1B57iY if you wanna track the issue for updates (or even fix it!) https://gitlab.gnome.org/GNOME/libadwaita/-/issues/801