Dell U2422H 23.8" 16:9 IPS Monitor - Manual (Page 51)

Setting Up the Monitor
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51
Vertical Extension
NOTE: The stand extends vertically up to 150 mm. The figure below
illustrates how to extend the stand vertically.
Rotating the Monitor
Before you rotate the monitor, your monitor should be fully vertically extended
(
Vertical Extension ) and fully tilted up to avoid hitting the bottom edge of the
monitor.