BMW Motorrad R 1200 GS Rider's Manual page 47

Headlight setting with
motorcycle heavily loaded
Only if the load carried on the
motorcycle is very high, the
headlight beam can also be
lowered by moving pivot
lever 1. This shortens the beam
throw.
A
B
Pivot lever 1:
A = neutral position
B = high load
Lights
1
1 3
45