Why don't sites open on Openserver?

Question

open server

Good day!
There are sites on Open Server.
All sites do not open, except for only one.
Previously, before the rollback of the Windows 10 system, everything worked fine, all sites started up.
Now I don't understand why it doesn't work. The browser says "Unable to access the site Could not find the IP address of the server php1.loc."
Already tried to set "all available IPs" in the Open Server settings, but still does not want to show sites, except for one. For this one, there was a setting that, on such a domain, open an index file on such and such a path.
I would be grateful for help in resolving this issue.

Answer 1

I had such a problem. It turned out that there was a checkbox against automatically assigning addresses to hosts:

The solution is to uncheck the box

Answer 2

In general, I don’t know what happened, but adding in the settings each domain and folder to which it will refer and opening this site through the menu, everything worked.
Otherwise it doesn't work. I do not know why.