Dell UltraSharp 38" 1600p Curved Monitor - Manual (Page 50)

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Setting up the monitor
Connecting the monitor for USB-C
If the Dell PC* has more than two USB-C ports, the power state of each connected
monitor will sync with the PC.
For example, 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 support.
NOTE: DPBS only supports the USB Type-C upstream port with
icon.