Dell UP2715K Monitor - Manual (Page 50)

50  Operating the Monitor
Rotating the Monitor
Before you rotate the monitor, your monitor should be fully vertically extended
and fully tilted up to avoid hitting the bottom edge of the monitor.
90°
90°
0°
0°
2
1
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 and see the Download section for Video Drivers for
latest driver updates.
NOTE: When in Portrait View Mode, you may experience performance
degradation in graphic-intensive applications (3D Gaming etc.).