Can i disable the switch off option while my phone is locked (running oreo 8.1)?

In case of theft, I would like to disable the option to turn off my phone while it's locked. I downloaded the smart screen protector app, but i guess it doesn't support my android device (p20 pro; orea 8.1) - i am still able to turn off my phone while it's locked and the app is running. Are there other application/methods, which would do the trick?

Thanks,

Max

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