Obviously it normally takes an spellcasting action to use Shape Change (Savage Worlds Deluxe EE, p. 115) to shift into animal form, but the description says nothing about how shifting back to normal form works.
I once had a player who wanted to shift out of crow form and make an attack in the same round, while the Shape Change was still within the 10-round (1-minute) duration. At the time I ruled that they could will the Power to end early but it would impose the multi-action penalty to the attack. Re-reading that old session report I'm not so sure I'd make the same ruling now, but I never figured out what the intended behaviour is. I'm going to be running SW again soon, so I've been going back and trying to learn from my early mistakes.
Does it take an action to return to normal form from a Shape Change?