Fromm & Starck STAR DESK 21 Manual De Instrucciones página 33

STEP 7: Leveling the desk
The desk is equipped with adjustable feet located under the base of the frame. If
the floor is uneven, level the desk by turning the legs.
Tip: you can use a bubble level to check that the desk is level.
CAUTION: When using the desk for the first time, the user should reset the
system (see section 3.3 for details).