OK I give up. I've read the manual, hit every button (both real and virtual) on the dash, and can I find how to disable it?
The following applies for
MY24 (for older models see
Kremmen's step-by-step instructions):
* press the Home button on the steering wheel
* use the scroll wheel and scroll to "Safety Support"
* press the scroll wheel to select Safety Support
* scroll down until you get to the RDMS icon (the car leaving the lane on the right)
* press the scroll wheel
* select the setting you want
Please keep in mind that this has to be repeated after every power-up (EU regulations).
(also see the manual p158)