User manual

Change the order of virtual navigation keys. The keys follow the typical order for
OPPO: Menu, Home, and Return from left to right. If you are left-handed, you can
change them to the return-home-recent order.
Hide the virtual navigation keys. When you launch a full-screen app, the keys will
automatically hide, and can be brought back with a simple swipe:
 When in portrait mode, swipe up from the bottom.
 When in landscape mode, swipe from the bottom to the left.