Need help finding sidebar widget with tabs

Hello all,
Firstly, I’m quite new to using WordPress so forgive my ignorance.

I’m trying to build a website from a template that I bought. Apparently, not all widgets that were displayed on the demo page were included in the actual theme itself, so I need to gather them by hand.

One that I’m currently searching for is marked in red on this image:
https://i102.photobucket.com/albums/m104/mrr_03/mrr_03081/widget.jpg

It shows two tabs with popular topics and featured topics. To see how it works, see the demo page: https://www.zign.nl/template-demo-41788.html
As you can see, all links in both tabs lead to blog posts.

I’ve been searching for tabs, sidebar tabs or anything near but I’m unable to make it look as in the screenshot. Perhaps I’m searching for the wrong thing if such area actually has a name.

Could anyone help me out?

P.S. There are more widgets on that page that I’m searching but that will come later. But if you happen to know one or two others, please let me know.