There’s players with a green dot on the back of their helmet. That signifies they have comms with the coaching staff through radio speakers in their helmet. It’s not just QBs on offense, a few defenders have them too. I’m not sure how many are allowed on the field at a given time but since you don’t see that many green dots, it’s safe to say there is a limit in place.
With those comms, the coaches/coordinators would tell them who’s in or out and they can relay that to the others.
*edit to answer the actual question
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