You can extend the middle jacks by introducing an error in the system (like disconnecting a front jack and trying to operate it, get error, then plug the jack back in), then press the left/right arrows simultaneously and the middle jacks will drop. But the will only drop simultaneously, you won’t have individual control.
2016 North Point 341RLTS
520watts of solar. Morningstar MPPT
4 6volt 235ah Surrette batteries
2017 F-350 Platinum CC SRW