When running under Gnome/Wayland on Ubuntu 22.04 default configuration, the '--fullscreen-borderless' is not actually fullscreen. The top horizontal panel (?) is still visible and the EmulationStation window is actually pushed down.
Running with just '--fullscreen' is enough, but this is the default, thus there's no need to add any additional parameters when Gnome/Wayland is the current session. Tested on an updated Ubuntu 22.04, with the default Gnome session.
When running under Gnome/Wayland on Ubuntu 22.04 default configuration, the '--fullscreen-borderless' is not actually fullscreen. The top horizontal panel (?) is still visible and the EmulationStation window is actually pushed down.
Running with just '--fullscreen' is enough, but this is the default, thus there's no need to add any additional parameters when Gnome/Wayland is the current session. Tested on an updated Ubuntu 22.04, with the default Gnome session.