Switching off the Oppo device under ColorOS is done with the Power button, but instead of the usual Android switch, the Oppo has to be pulled down to switch it off.

Android 10 (ColorOS 7.0)
Step 1:  Press and hold the  Power-Key
Step 2:  Drag the  circle  down
Step 3:  Release the  circle  to switch off the device
  1. Press and hold the Power-Key
  2. Drag the circle down
  3. Release the circle to switch off the device

Oppo Instructions
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