Where's the basic theme for the Wiki plugin?

The screenshots on the promotional Wiki plugin page show a basic wiki-type theme:

https://premium.wpmudev.org/wp-content/projects/168/screenshots/1686095187_wiki91.jpg

I don't see anything like this theme available in the WPMUDEV dashboard themes, though. Instead, it's jamming the wiki content into whatever other more elaborate theme I select.

How do I get it to look like the bare-bones wiki in the screenshot?