Why did Blender start behaving like this?

Question

Blender

In general, I accidentally pressed something, now when you zoom in, it’s as if something appears in front of the screen, and the model is not visible when you twist it, objects generally cut transversely, as it were.
What is it, how to turn it off tell me?
The video is attached:
nimb.ws/uob65G

PS Such nonsense is only on the "perspective" view, on the "orthography" everything works fine.
Perspective


Orthography

Answer 1

Phew, figured it out, it was necessary to reset the value of Clip Start