Switching the split screen on and off
1. 
Press the button.
2. "Split screen"
See also:
Automatic deactivation during forward travel
The system switches off when a certain driving
distance or speed is exceeded.
Switch the system back on if necessary. ...
Switching on automatically
With the engine running or the ignition switched
on, shift the selector lever into position R.
The image of the rear view camera is displayed
when the system has been switched on using
iDrive. ...
Transmitting the settings
Your personal settings can be taken with you to
another vehicle equipped with the Personal Profile
function. For more information, contact your
service center.
Transmission takes place via:
...