I have a main camera and another camera but in the game view i see the camera not main camera why ?

I created a new project.
Added a new camera. But i want to see in the game view the main camera.
Instead it’s showing the added camera not the main camera.

As far as I know, the Main Camera tag do not force a camera to render on top of another one, it only let you find this camera using Camera.main in a script.
You’ll want to play with the cameras’ depth to pick which one should render final.