Dell SE1918HV User Manual page 30

The following dialog appears on a black screen as the
monitor self-adjusts to the current input:
Auto Adjustment allows the monitor to self-adjust to the
incoming video signal. After using Auto Adjustment, you can
further tune your monitor by using the Pixel Clock (Coarse)
and Phase (Fine) controls under Display.
NOTE: Auto Adjust does not appear if you press the button
while there are no active video input signals or attached
cables.
30 │ Operating the Monitor