How to change change FPS mode to TopDown mode when playing?

Hello everyone.
I have a project with the default FPS template and everything works great, but now I need to add an option to change the camera from First person to Top view, and rotate and zoom in/out. (like a showcase of a single object, turntable).
What’s the best way to do it? I tried to add a new camera to the character but that’s bot the solution I’m looking for.
Can I change the game mode from the FPS template to the TopDown template with a press of a button ? if so, how?

Thank you