Adjusting the glass slide/tilt sunroof cover
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2016 BMW 760Li, 2015 BMW 760Li, 2014 BMW 760Li, 2013 BMW 760Li, and 2012 BMW 760Li. However, it is still accessible from the selected car via links, so may be relevant.
Remove GAITER on left and right.
Close glass slide/tilt sunroof cover again (zero position).
Slacken screws (1) on left/right little by little.
Until glass slide/tilt sunroof cover (2) can still just be moved.