Dell UltraSharp 38" 1600p Curved Monitor - Manual (Page 59)

Operating the monitor
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Input Source 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 Automatically scans for available input sources. The
default is
On . Press the joystick to confirm the
selection.