Edit ::: oops i am wrong, there is a way to disable it, check advanced in the preferences expand interface/Main interfaces/macosx and the 2nd check-mark box from the top ( show full screen controller ) needs to be unchecked. and press save. i think having the advanced checked at the bottom left of ...
well, normally you would move the mouse pointer away from the floating control box (like take it above the control box about a inch or so) and it comes back up when you move the mouse down to where the control box is ( or just move the mouse ), but i have had issues where it would not go away even ...