Dell P2722HE 27" 16:9 USB Type-C IPS Monitor - Manual (Page 43)

Setting up the monitor
│
43
Ensure to set USB-C Charging 65W to On in Off Mode . When the PC and
two monitors are in an initial OFF power state, pressing the power button on
Monitor 1 or Monitor 2 will turn ON the PC, Monitor 1, and Monitor 2.