No way to exit fullscreen mode on a touch device
There is no way to exit the fullscreen mode after entering without using the keyboard or mouse.
While I can leave the fullscreen with a double tap with a mouse I cannot do it on a touchscreen device with wayland.
Also there is no on screen button, only next,previous and rotation controls.
Fedora 30, Wayland, Gnome 3.32, eog 3.32.1