Dell P2223HC 21.5" 16:9 IPS Monitor - Manual (Page 43)

Setting up the monitor
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Connecting the monitor for USB-C
The Dell PC* Ultra platform has two USB-C ports, so both Monitor 1 and Monitor 2
power state can sync with the PC.
When the PC and two monitors are in an initial ON power state, pressing the power
button on Monitor 1 or Monitor 2 will turn OFF the PC, Monitor 1, and Monitor 2.
*Ensure to check the Dell PC for DPBS supportability.
NOTE: DPBS only supports the USB Type-C upstream port.