I wish to disable the small focus box from moving around the screen as I frequently accidentally move it with my thumb or nose. I have gone into the Menus and switched Touch and Drag to disable but it does not change. I also tried highlighting the effective area of then screen to one corner but this feature does not change either. What am I doing wrong please? Do I need to update software. This is a relatively new camera and it is the first time I have tried to do this.