Swap Character

Hello guys, I need a little help over here.
So basecly, I mix my RollingBall project with ThirdPerson project to get the the settings for the camera fixed. Now I would like to know how do I swap the Character to be played.
Everytime I press PLAY, the Character who will be playable is the Rolling ball (the big one) and not the ThirdPerson (the small ball). How can I swap that?
Thank you in advance.

So, nobody can help with??? Is really hard to do it or even is it IMPOSSIBLE to no have any aswer til now??
I post that yesterday and 10 people saw that post but no aswers. what a shame :(:frowning:

I world settings, make sure the game mode you’re using has the correct default pawn set.