A Question of Companionship

[Occursus]

In Pillars of Eternity I, fellow companions you did not bring along with you saw their growth halted altogether – unless you sent them on adventures, that is.
 

In the same spirit, in the Deadfire, how one goes about keeping all companions more or less on the same footing without painstakingly switch them in and out of your group all the time ?
 

I might not have gotten far enough yet, so sorry if such is the case. But in the off chance I did not notice something, I am eager to have some answers on that.
 

Thanks in advance, everyone !