Thanks for the answer
By permission you mean the 'Allow full control of device' thing in QGO settings?
I figured that turning off the HMD reverted everything back to defaults. I had some problem understanding the going back to default state procedure as it turned out some of the games I tried (like GravityLab) just didn't properly work with QGO. So what I thought was the 'enhanced by QGO' (from which I wanted to exit back) graphics were actually the default settings anyway.
Anyways - cool and handy app. Too bad it's a bit of a hassle with those permissions which have to be renewed everytime you turn on the headset but still.