How to make 2nd Hotbar active if and only if swap button is held down in Big Picture
We need to add 2 activators to a button:
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first called Start Press makes a Hotbar swap when you press △
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second called Release Press makes another Hotbar swap when you release △
The combined result of these two behaviours - 2nd Hotbar showed if and only if you hold △
What may interest you: [Guide] Autocasting for controller in Big Picture and Grim Internals