Disconnect built-in display when an external display is connected

[adamsken1717]

Can you please add this feature?

"Disconnect built-in display when an external display is connected" or "Dim display when an external display is connected"

When an external monitor is connected, the brightness on the in-built display should automatically reduce to zero. I currently implement this using Keyboard Maestro but it would be great if it is implemented through BD. Thanks.

[dimitrij2k]

Disconnect feature would be awesome! Thanks @waydabber for adding it... :-)

[waydabber]

When trying to reconnect the built-in display when the setting is enabled and also an external display is connected: