Dell P2223HC 21.5" 16:9 IPS Monitor - Manual (Page 42)

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Setting up the monitor
Connecting the monitor for USB-C Multi-Stream Transport (MST) function
A PC is connected to two monitors in an initial OFF power state, and the PC system
power state is in sync with Monitor 1 power button. When you press Monitor 1 or
PC power button, both Monitor 1 and PC turns ON. Meanwhile, Monitor 2 will
remain OFF. You need to manually press the power button on Monitor 2 to turn it
ON.
Similarly, a PC is connected to two monitors in an initial ON power state, and the PC
system power state is in sync with Monitor 1 power button. When you press Monitor
1 or PC power button, both Monitor 1 and PC turns OFF. Meanwhile, Monitor 2 will
be in Standby mode. You need to manually press the power button on Monitor 2 to
turn it OFF.