Ducati MONSTER S4R Manuel D'utilisation Et Entretien page 134

Notes
This is the procedure specified by Italian standards to
check the maximum height of the light beam Owners in
other countries will adapt said procedure to the provisions
in force in their countries.
To adjust the vertical setting, use the screws (1, fig. 60)
securing the headlight to its side mounts.
E
1
fig. 60
57