Help adding links to WP comments

I’ve hired someone to respond to users’ comments on my blogs. She replies directly through the comments form. She is very non-technical.

Apparently, before upgrading to the latest WordPress, there was some kind of tab or field in our comments form that helped her format links so they weren’t just raw URLs. She would hit some sort of tab that would pop up a URL interface, and that would allow her to make a link that looked like:

* Here is a description of the link

Instead of:

* https://some-random-domain.com/with-a-really-long-url/blah-blah/blue-cow

I’ve searched and searched but I can’t for the life of me recall what kind of function was in the commments form to help her do that, nor can I see in wayback or the google cache, but I know it was there.

Can anyone help me remember what kind of plugin or theme function would let a non-technical person insert formatted URLs through the comments interface? I have spent hours trying to figure this out.