Dell U3821DW 37.5" 21:9 Curved IPS Monitor (Silver) - Manual (Page 29)

Setting up the monitor
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8. Place the monitor upright with the protective cushion attached.
NOTE: Lift the monitor carefully to prevent it from slipping or falling.
9. Tear apart the zipper die-cut in the middle of the protective cushion, then
remove the protective cushion from the left and right side of the monitor.