What is this spherical ball on my game and how do i remove it?

How do I remove this sphere?

After creating a new blank bp project. All i did was add a geometric box and camera. I changed the dimension of the box, the location and rotation of the camera and set the camera to Player 0.
Everytime from the second time i click play. This sphere will be on or behind the camera and can be controlled by the w,a,s,d,space and ctrl key.

This is default pawn.

You can remove it by creating your own player pawn class.