Fast Brightness Control 4+

when using power off display, it powers off everything including the external monitor screens. im looking to just power off the macbook screen only while the external screens are on. with this app you just turn the brightness all the way down but if you go to settings and display it still shows that the macbook screen is still on. reason i need the macbook screen off, so i can use all the cpu, graphacis, and etc on just the external monitors. i could just close the macbook but i need it to get air flow or keep getting up to close or put a magnet to trick it.

I have an iMac and two external Dell 4K monitors I want to control, but it only controls the main monitor which is already easy to do from the keyboard or preferences.

I upgraded to a current macbook and OS. There was a feature that was missing, adjusting the scren on my laptop while I’m mirroring to an external monitor. I tried different apps and widgets. Many of them free and paid. These apps only partially dimmed the screen on my laptop or both. Fast brightness control lets me lower the screen on my laptop to off and not the external screen! Thank you!