Dell E2213H Monitor - Manual (Page 29)

Aspect Ratio
(for
E2013H/E2213H/E2313H Adjusts the image ratio as Wide 16:9, 4:3, or 5:4.
NOTE: Wide 16:9 adjustment is not required at maximum preset resolution 1600 x 900 (for E2013H) or 1920 x 1080 (for