Dell S718QL User Manual page 51

At the Photo playback screen, press the button on the control panel or remote
control to access the photo playback control. Then you can use the following
buttons on the screen to control photo playback.
Rotate Rotate Zoom + Zoom - Up / Down / Left / Right Reset
Right Left
(in Zoom mode)
Slideshow Information Slideshow
settings
The Setting Source Screen shown below appears:
51
Using Your Projector