I have just installed latest version 2019.10.06. Playing around with Dial menu etc.
Decided to look at 3D in full screen, picture fine.
Did right click and selected in the drop down list "pcb" and nothing happened? Is it not supposed to open the pcb in full screen?
I went out of full screen using F11 and then selected pcb and went to full screen, looked very nice. Then right click and from drop down list selected 'schematic' and again nothing happened. The only two thing I have had time to test in full screen.
No problem going out of full screen mode and then make the selection.