Dell S3221QS User Manual page 54

There are three lock options.
Menu
1 Menu Buttons
2 Power Button
3 Menu + Power
Buttons
+
4 Built-in Diagnostics See
NOTE: To access the Lock or Unlock menu – Press and hold the Exit
button (button 4) for four seconds.
In the following scenarios, the
• When Up button (button 1), Down button (button 2), Menu button (button 3),
or Exit button (button 4) are pressed. This indicates the OSD menu buttons
are in lock state.
• When the Power button (button 5) is pressed. This indicates the Power
button is in lock state.
• When any one of the five buttons are pressed. This indicates OSD menu
buttons and the Power button is in lock state.
Unlocking the OSD menu and Power buttons：
1. Press and hold the Exit button (button 4) for four seconds. The unlock menu
appears.
2. Select the unlock icon
54 │ Operating your monitor
Description
When Menu Buttons is selected, the OSD menu
settings cannot be changed. All buttons are locked
except Power button.
When Power Button is selected, the display cannot
be turned off using the Power button.
When Menu + Power Buttons is selected, the OSD
menu settings cannot be changed and the Power
button is locked.
Built-in diagnostics
icon appears at the center of the display:
to unlock the buttons on the display.
for more information.