Dell P2723QE 27" 4K UHD USB Type-C Hub Monitor - Manual (Page 39)

Setting up the monitor │ 39
Shutdown with 4 seconds Power Button press
When the monitor and the PC power state are both ON, press and hold the monitor
power button for 4 seconds , the screen prompt will ask if you would like to shut down
the PC.
PC will shut down
USB Type-C
Slide to shut down your PC
Force shutdown with 10 seconds Power Button press
When it necessary to force shut down the system, press and hold the monitor power
button for 10 seconds.
PC will shut down
USB Type-C