Why is my game switching to a 1st person view in a 3rd person project?

I was creating my level in my 3rd person BP project.I clicked play as usual,but this time the player became a defaultpawn with first person view rather than my character with 3rd person view.I have searched many tutorials which guide you to edit my character BP but I found nothing on how to solve this issue.Could anyone tell me how to switch my player back to my character?

Solved this problem by creating a new game mode BP using “my character”.