Dell U3821DW 37.5" 21:9 Curved IPS Monitor (Silver) - Manual (Page 55)

Operating the monitor
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Lock With the control buttons on the monitor locked, you
can prevent people from accessing the controls. It
also prevents accidental activation in multiple
monitors side-by-side setup.
• Menu Buttons : All joystick functions are locked
and not accessible by the user.
• Power Button : Only the Power button is locked
and not accessible by the user.
• Menu + Power Buttons : Both the joystick &
Power button are locked and not accessible by the
user.
The default setting is Disable .
Alternative Lock Method: You can move and hold the
joystick up/down/left/right for 4 seconds to set the
lock options via the pop-up menu, and then press the
joystick to confirm the configuration.
NOTE: To unlock, move and hold the joystick up/
down/left/right for 4 seconds, and then press the
joystick to confirm the changes and close the pop-up
menu.
Reset Menu Resets all OSD settings to the factory preset values.