MyBB Community Forums

I was on a forum, and I was looking through a thread with more than fifty pages. I needed to look at a page that was in between numbers 31 and 50, but it didn't show all the numbers. I saw that the ... was click-able, and I clicked it. It showed all the numbers. I went to a MyBB forum, and saw that I wasn't able to do that. My question is, how do I get my forum to be able to do that?

Probably a plugin that lists page numbers, have you asked the forum owner?

I believe MyBB Source has this.

What is the plugin called?