Rotate Clockwise; Rotate Counterclockwise - Dell S2721QSA User Manual

Rotate clockwise

Rotate counterclockwise

NOTE: To use the Display Rotation function (Landscape versus Portrait
view) with your Dell computer, you require an updated graphics driver
that is not included with this monitor. To download the graphics driver,
go to www.dell.com/support
Drivers for latest driver updates.
NOTE: In the Portrait mode, you may experience performance
degradation when using graphic-intensive applications, such as 3D
gaming.
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66 Operating the monitor
and see the Download section for Video