This is the Player Start actor that was placed by default when you create a new project.
I wanted to deactivate this camera, and switch over to another camera.
I know that to do a switch, I do this:
OldCamera->Deactivate();
NewCamera->Activate();
And I know that in the GameMode.cpp, I need to set the default pawn actor, which I did this in the constructor:
DefaultPawnClass = AMainCore::StaticClass();
Where the MainCore actor contains a CameraComponent attached to a SpringArmComponent, which is attached to the root component of MainCore actor.
I expected my view to possess the camera of MainCore, but it actually possessed the camera of Player Start.
What else do I need to do?