Nowadays, there are many different modes, such as Do Not Disturb, Sleep Time, or Concentration Mode, that prevent us from turning off the smartphone.
It is still useful to turn off the Huawei smartphone occasionally, as applications, processes, and services are terminated and installations are completed in the background. Besides, the battery life is also extended.

Android 10 | EMUI 10.0
Power off -  Tap and hold the  power button
Power off -  Tap on  Power off
Power off -  Confirm with  Touch to power off
  1. Tap and hold the power button
  2. Tap on Power off
  3. Confirm with Touch to power off

Huawei Instructions