When testing on GNOME, to verify if a window is indeed a Wayland window: 1. Alt+F2, type 'lg', and press Enter 2. Switch to the "Windows" tab 3. In the list, find the line with LO's window title, and click on that line 4. In the opened popup, the first line should have "GType: MetaWindowWayland". If it's "GType: MetaWindowXwayland" (not the extra "X"), then it's x11 and not Wayland. (From bug 152088 comment 12, thanks Maxim)