In System Settings / Budgie Control Center, clicking the three vertical dots and choosing help results in an empty window.
I created an issue at Github: https://github.com/BuddiesOfBudgie/budgie-control-center because I suspected the problem would be in Budgie.
The answers I got was:
On Arch, this requires manual installation of yelp for the window to appear, and gnome-user-docs for the actual documentation to appear. Could be a Solus packaging issue, yeah.
and
Yea this is likely a Solus packaging issue. Yelp / Yelp-related docs weren't typically enabled.
I Found out that gnome-user-docs is installed out of the box, but yelp is not to be found in Software Center. I suspect that is the core of the problem. What could be done about that?