Dell U3821DW 37.5" 21:9 Curved IPS Monitor (Silver) - Manual (Page 42)

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Operating the monitor
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.