How can I turn off display on MacBook Pro when it is connected to the external display?

I recently bought an external screen made by HP and I have a problem. When I connected it to my MacBook Pro, I would like to turn off the display on the MacBook Pro completely, because it is a loss of power. I tried to turn the brightness all in low, but who is not actually turn off the display. Also, I tried many commands found on the web Terminal, and none of them does not seem to work. Does anyone know a solution?

All responses are greatly appreciated.

Test

Tags: Notebooks

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