Can't Quit on Pimax Crystal

Ok, this is going to sound pretty noobish, but how do I exit Open Brush? Using Pimax Crystal, OB seems to work well, did some scribbling to play with tools, tried many menus etc. But there is no Exit option anywhere that I can find, and my usual main Pimax VR button doesn't respond to pressing, to open its own menu to return back home - in fact neither the Pimax-logo nor the pancake-menu buttons respond. I have searched the OB HTML manual on the web; doesn't seem to be any mention of exiting the program. Is it a controller mapping/emulation issue? As near as I can tell, all other physical buttons are working, and tracking seems fine. Thanks!
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