Using an XP1 and an XP2 to control rekordbox simultaneously

Im trying to set it up so that my DDJ XP1 controls decks 1 and 2...and my DDJ XP2 controls decks 3 and 4.

Currently the controllers both control decks 1 and 2. If I press "shift int" on either controller, then both controllers shift their focus to a new deck.

This means I can only directly control 2 decks at the same time - and I want to control 4 decks at the same time.

I basically want instant control over all 4 decks, and never have to press "shift int" on either controller ! is there a way of doing that ?

Thanks