Dell U3821DW 37.5" 21:9 Curved IPS Monitor (Silver) - Manual (Page 47)

Operating the monitor
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Saturation This feature can adjust the color saturation of the
video image. Move the joystick to adjust the
saturation level from '0' to '100'.
NOTE: Saturation adjustment is available only
when you select Movie or Game preset mode.
Reset Color Resets your monitor’s color settings to the factory
settings.
Display Use the Display menu to adjust images.
Aspect Ratio Adjusts the image ratio to Wide 21:9 , Auto Resize ,
4:3 , or Pixel-for-Pixel .
Sharpness This feature can make the image look sharper or
softer.
Move the joystick to adjust the sharpness level from
'0' to '100'.
Response Time Allows you to set the Response Time to Normal or
Fast .