It is a well-known fact that smartphones today come with many different modes that make it unnecessary to turn off the device.
These include, for example, Do Not Disturb, the concentration/rest mode or the relaxation mode.
Each mode differs in its functionality, but ensures that we are not disturbed or distracted even though the device is turned on.

It is still useful or recommended to turn off the OnePlus smartphone from time to time, as this will clean up the system or memory, terminate background processes and complete installations.

A further advantage is the allowed resting phase for the battery, which not only leaves the battery capacity untouched, but also extends the life span, as fewer charging cycles are necessary.

Android 10 | OxygenOS 10.0
Turn off -  Press and hold the  power button
Turn off -  Tap on  Power off
  1. Press and hold the power button
  2. Tap on Power off

OnePlus Instructions