How to specify the order of external monitors for BTT to move an app to ?

You would need to specify that yourself using the "Custom Move / Resize" Action. It can either try to figure out the next display like this:

Or you can manually specify the screen like this:

If you use the second option you could put multiple custom move/resize action into a "cycle through multiple actions" meta action to cycle through different screens in an order you specify.

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