Dell U2413 Monitor - Manual (Page 3)

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.