turning it off is a single button on the app, so not much to say about it. touch and green shows up saying it is on, touch again and it moves to off.
I think it disables the F mode, but don't quote me on that till I RTFM tonight again.
although the manual is wrong about rth suicide mode, was out today turning it off for practice. toggle s1 beeps, toggle again. just toggling it doesn't turn it off as manual says. a gopher or squirrel was running around the edge of pond, can't wait to see if I got it. I was to close to trees, and water to look at screen. Had some irregular wind eddies in the hollow making drone shift and drop at random.