Maintaining/storing the speed
Press the button.
or:

Press the rocker switch while the system is interrupted.
When the system is switched on, the current speed is maintained and stored as the desired speed.
It is displayed in the speedometer and briefly displayed in the instrument cluster, Displays in the instrument cluster.
When cruise control is maintained or stored, DSC Dynamic Stability Control is switched on, if necessary.
See also:
Releasing
With the ignition switched on:
Manual transmission: Press the
switch
while the brake or clutch is pressed.
Automatic transmission: Press the switch while
the brake is pressed or transmission ...
Indication in the info display
The information from the onboard
computer is shown in the
info display in the instrument
cluster. ...
Tire inflation pressures X5 xDrive50i with two rows of seats
...
