Dell UltraSharp U3821DW User Manual page 42

Input Source Use the Input Source menu to select between the
different video signals that may be connected to your
monitor.
USB-C 90W
Select USB-C 90W when you are using the USB
Type-C connector. Press the joystick to confirm the
selection.
DP Select DP when you are using the DisplayPort (DP)
connector. Press the joystick to confirm the
selection.
HDMI 1 Select HDMI 1 when you are using the HDMI 1
connector. Press the joystick to confirm the
selection.
HDMI 2 Select HDMI 2 when you are using the HDMI 2
connector. Press the joystick to confirm the
selection.
Auto Select Turning on the function allows you to scan for
available input sources.
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42 Operating the monitor