Dell S2230MX Monitor - Manual (Page 23)

Auto Select Select Auto Select to scan for available input signals.
VGA
Select VGA input when you are using the analog (VGA) connector. Push to select the VGA input source.
DVI-D
Select DVI-D input when you are using the Digital (DVI) connector. Push to select the DVI input source.
COLOR SETTINGS Use the Color Setting menu to adjust the monitor's color settings.