Party Switch allows the player to switch any party member (except for the protagonist) during battle. The target to be switched out must not be knocked out or in status ailments. This mechanic is useful in switching party members who show weaknesses to certain elements or to prevent them from being knocked out if the player can't heal them in time.
Initiating Hifumi Togo's Star Confidant allows only the protagonist to give the order. Progressing further in the Confidant will allow any party member to give this order. However, switching party members will cost the player's turn and need to wait for next turn to act.
Additionally, Futaba Sakura can offer to switch knocked out party members through her Confidant abilities. If the player progressed Tower confidant with Shinya Oda, a switched out party member can trigger a random fire follow up attacks for additional damage.