Dell U3014 Monitor - Manual (Page 10)

Some Dell models provide Rotation features. On monitors with a Menu Rotation option under Other Settings in the OSD menu, changing the menu orientation will automatically trigger a
corresponding change in Windows screen orientation. On monitors with an Auto Rotate option under Other Settings in the OSD menu, enabling this option will automatically trigger a
corresponding change in Windows screen orientation when the physical orientation of the display is changed.
A Rotate image button on the Options tab and in the Quick Settings dialog may also be available on select models, to manually rotate 180˚ screen orientations.
Rotating Screen Content