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How do you change what the default playable actor is?

Or the actor’s controller?

You need to possess a pawn. A very easy way to do it is to go to the details of the pawn and set the auto possess to player 0.

Here you go:

https://docs.unrealengine.com/latest/INT/Gameplay/HowTo/PossessPawns/Blueprints/index.html