Well I don't know if this is possible, but I want my MBP screen to be off cuz it heats up and use my external display. I know I can go into mirror mode first then close the MBP then wake it up. But I want to purely start with the external display and not have it turn on at all. Just curious to see if there is such a feature as this would save me a lot of hassle of sleeping it then waking it up so that the screen is off.

I hope you guys understand my question lol.