Its GNOME Boxes and therefore the best and nothing else matters according to GNOME logic. This is the Desktop Environment in an ecosystem where the window manag

Its GNOME Boxes and therefore the best and nothing else matters according to GNOME logic. This is the Desktop Environment in an ecosystem where the window manager draws the title bars that decided the app needs to draw the title bars so you can really easily get two title bars on a GTK app when used on not GNOME.