Dell UltraSharp 42.51" 4K Monitor - Manual (Page 67)

Operating the monitor | 67
Use the joystick to lock the button(s).
Press the left directional navigation of joystick for four seconds, a menu appears on the
screen.
Select Option:
Select one of the following options:
Options Description
1
Menu button lock
Select this option to lock OSD menu function.
2
Power button lock
Use this option to lock power button. This will
prevent the user to turn off the monitor using the
power button.
3
Menu and power button
lock
Use this option to lock OSD menu and power
button to turn off the monitor.