Camera Preview troubles

Hi, there! I recently opened a training Unity project, after which the camera is no longer displayed on any project. I also can’t see a camera icon, frustum and my terrain. The camera is selected in the Hierarchy, and menu Gizmos of Scene is correct. How can there be a problem? Is there any way to return the settings to the original state? How can i fix it?

Thanks!

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Check your gizmos. I bet it’s 3d and you’re too far so you don’t see the icon AND the camera toggle isn’t checked in the gizmos list. It’s on top of the scene view, next to the search bar.

the solution
http://answers.unity3d.com/answers/1222950/view.html