Mercedes-Benz G-Class 2010 COMAND Manual - Manual (Page 183)

Changing the Picture Format
X In the AUX menu, select Display Aux or
Drive Aux.
The ä icon in front of one of these menu
items:
16:9 optimized, 4:3 or Wide
Screen indicates the currently selected
format.
X To switch formats: Press n or ý
until the desired format is selected.
X To save setting: Press 9.
Aux Operation
181
Rear Seat Entertainment
Z