Select: Function selector button CAR > control button Car systems > Driver assist > Parking aid > Switch-over front/rear > auto or manual.
auto - the rear view (directly behind the Audi A8) is automatically shown when you select reverse gear. The front view (directly in front of the Audi A8) is automatically shown when you select a forward gear.
manual - the rear view (directly behind the Audi A8) is always shown when you switch on the system; the front view is not automatically shown when you select a forward gear.