Dell U2422H 23.8" 16:9 IPS Monitor - Manual (Page 79)

Operating the Monitor
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b. When connecting HDMI + USB-C2 to computer 1 and USB-C 90W to
computer 2:
NOTE: The USB-C connection currently supports video and data
transfer.
Ensure that USB for HDMI is assigned to USB-C2 .
NOTE: As the USB-C upstream port supports the DisplayPort
Alternate Mode, there is no need to set USB for USB-C 90W.
NOTE: When connecting to different video input sources not shown
above, follow the same method to make correct settings for USB to pair
the ports.