I think the only solution is to change the .htaccess file but I do not know what to disable ...

good evening,
I wanted to ask you how to solve this problem:

I inadvertently activated the "Disable creation of new SEF URLs?"
and now I no longer see any page in the site.

This is the message that appears:

not Found

The requested URL /korastudio-01/index.php/chi-siamo was not found on this server.

Thanks for your help!