Help mapping four deck mixer

I have the gemini 4v and I’m manually mapping out the controls.

My current issue is figuring out how to toggle the decks on the controller to switch between decks 1 and 3 on the left side, and decks 2 and 4 on the right in the program.

I see that I can control the selected deck mappings but there is only really one “selected deck” to work with and there are two sides on the controller that I want to be independent.

Another issue I’m having is that the toggle button only toggles between decks 1 and 2, leaving decks 3 and 4 unusable.

Any ideas guys?