I use SecondBar to add a menu bar to an external display. I've added it to my login items, but I don't want it to open when there isn't an external display. How do I open SecondBar when a secondary monitor is connected?
MacOS – How to open an application when a secondary monitor is connected
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Best Answer
Take a look at the free/open source app ControlPlane.
You can trigger different actions based on context-sensitive rules, including launching an app in response to connecting a display.