It's possible but it took me a while to find the butten as well. It's to the left of the "increase power" button, with quite a low opacity.

I think it might be better to use the empty areas in the corners for the controls.

I can relate to this, but always explained it away in the opposite direction: I never trained my memory very much because I was able to work things out on the fly. Who knows, maybe there isn't much of a link between the two at all.

> I never trained my memory very much because I was able to work things out on the fly

I actually always thought it was the opposite for me – I had to figure out how to work things out from scratch because I could never remember anything.