Whenever players are instructed to, they must choose 4 Adventurers from their party that form the Active Group. The Active Group is the set of Adventurers the players are actively using during Encounters. The Active Group can only be changed when instructed to via Adventure Mechanics or Special Encounter Rules, most often in the Story Round (see Story Rounds Pg. 13). Outside of an Encounter, the party may only exchange items when an Adventure Mechanic instructs them to do so.
The Scene “Dangerous Split” is incorrectly listed as being on page 253.
The correct page number for “Dangerous Split” is page 254.