See also:

Sound output
Switching on/off When the ignition is switched off: press ON/OFF button on the radio. Muting When the ignition is switched on or the engine is running: press the ON/OFF button on the radio. ...

ConnectedDrive or BMW Assist
...

Driver's door controls
Roller blind for rear window Press the button. Extending or retracting the roller blinds together Press and hold the button. ...