Dell U3821DW 37.5" 21:9 Curved IPS Monitor (Silver) - Manual (Page 36)

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Setting up the monitor
Removing the monitor stand
NOTE: To prevent scratches on the LCD screen when removing the
stand, ensure that the monitor is placed on a soft, clean surface.
NOTE: The following instructions are applicable only for removing the
stand that was shipped with your monitor. If you are removing a stand
that you purchased from any other source, follow the setup
instructions that were included with the stand.
To remove the stand:
1. Place the monitor on a soft cloth or cushion.
2. Press and hold the stand release button.
3. Lift the stand up and away from the monitor.