Dell P1913s Monitor - Manual (Page 2)

The Quick Settings dialog box also provides access to Dell Display Manager's advanced user interface which is used to adjust Basic functions, configure Auto Mode and
access other features.
Setting Basic Display Functions
A Preset Mode for the selected monitor can be manually applied using the menu on the Basic tab. Alternatively, Auto Mode can be enabled. Auto Mode causes your
preferred Preset Mode to be applied automatically when specific applications are active. An onscreen message momentarily displays the current Preset Mode whenever
it changes.
The selected monitor's Brightness and Contrast can also be directly adjusted from the Basic tab.