Unity Main Camera borders are disappearing - unity3d

Sorry for my English. I'm new at game development and unity. I'm watching a tutorial about this. In this tutorial Main Camera borders seems to be like that:
tutorial
And this is my 2d project:
project
And even though this guy select other objects main camera borders don't disappear. But if I select a different object while the main camera is selected, its borders are disappearing like this:
tutorial
I searched some settings in the properties of Main Camera but i couldn't find a setting for fix this. How can i fix this?

Gizmos>Check Camera .
Image

I had the same problem, cause accidentally i deleted my Main Camera, you need to check the tags of your camera in the inspector, verify if it's in "MainCamera" tag. :)
Edit Game tags

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enter image description here
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enter image description here
There's an additional step that's not posted in most 360 vid tutorials.
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enter image description here
Scene like this.
enter image description here
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Liu Steve 👋. This is Nate, the founder of Vuplex, which makes the 3D WebView asset you're using. Since your screenshot shows that nothing is rendered at all, that makes me suspect that the wrong side of the WebViewPrefab is facing the camera. WebViewPrefab renders to a Quad, which is only one visible from one side. So, please check that the correct side is facing the camera. I recommend checking out 3D WebView's SimpleWebViewDemo scene for reference.

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