Dell SE1918HV User Manual page 40

Lock
Reset Menu
Personalize
40 │ Operating the Monitor
Controls user access to adjustments. When Lock is selected,
no user adjustments are allowed. All keys are locked except
key.
NOTE: When the OSD is locked, pressing the menu key
takes you directly to the OSD settings menu, with 'OSD
Lock' pre-selected on entry. Press and hold
seconds to unlock and allow user access to all applicable
settings.
Select this option to restore default menu settings.
Selecting this option allows you to set two shortcut keys.
key for 6