"Search by text" not working?

You missed the link.

And what is “Search by text addon filter”? We have a search widget but it’s not called that.

Aha sorry here is the actual link of website.

https://savetizadvorista.com/enciklopedija-biljaka/

By “Search by text addon filter”
i mean this:
Woocommerce => Settings => Products Filter=>Exstensions =>Searching by Text

I enabled it, and when i use it it is not working , it show me all products whatever i inserted in searchbox

Thank you

This is not a core feature, this is an addon. You’ll need to ask the extension developer directly.