Question about Contini Height adjustable office desk (120 cm)

According to the supplier:
The height can be adjusted by setting the desired height, then the "M" must be pressed and then the memory location (1 / 2 / 3) must be selected.
To reset the settings, one must hold down "M" and "3" for about three seconds.
When the table is received, however, no heights are set yet, the customer can select and set them himself.