Dell UltraSharp 25 Series User Manual page 41

Input Source Use the Input Source menu to select between the
different video signals that may be connected to your
monitor.
USB Type-C Select the USB Type-C input when you are using
the USB Type-C connector. Press the button to
confirm the selection.
DP Select the DP input when you are using the
DisplayPort (DP) connector. Press the button to
confirm the selection.
HDMI Select the HDMI input when you are using the HDMI
connector. Press the button to confirm the
selection.
Auto Select Turning on the function allows you to scan for
available input sources.
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Operating the monitor 41