BenQ RL Series User Manual page 9

Extend the monitor to the maximum extended position.
-90
Then tilt the monitor. And rotate the monitor 90
degrees counterclockwise as illustrated.
You might want to adjust the monitor stand height. See
Adjusting the monitor height on page 14
for more
information.
You should position the monitor and angle the screen to
minimize unwanted reflections from other light sources.
How to assemble your monitor hardware 9