You must keep your hands on the steering wheel at all times.
The controls are on the steering wheel.
Active Drive Assist  Press the button.
The indicator appears in the instrument cluster display. When the system is on, the color of the indicator changes to indicate the system status.
You can override the system at any time by steering your vehicle.
Note:   The correct requirements must be met before you can switch the system on.   See   Lane Centering Requirements
Enabling and Disabling Lane Centering
  1. Access the vehicle drawer on the touchscreen.
  1. Press SETTINGS.
  1. Press Driver Assistance.
  1. Press Cruise Control.
  1. Press Adaptive Cruise Control.
  1. Press Lane Centering Assist.