Dell Venue Pro Guide De Mise En Route page 15

Screen orientation
The screen reorients automatically depending on the way you
hold the phone.
Rotate the phone sideways to change the orientation of the
screen from portrait to landscape mode, and vice versa. In
landscape mode, the screen content expands to fit the screen.
NOTE: The Start screen and Applications list always
appear in portrait mode. Landscape mode is not supported
on certain applications or while the physical QWERTY
keyboard is open.
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