For several years, Wikia/Fandom had a good-looking system of transcluding from a central repository any standard Help page that had the same name as any of our help pages, putting the material in a box below whatever wiki-specific content we chose to insert. Recently they stopped that and simply redirect our pages to the matching central ones - or even further with a redirect - effectively wiping all of our help material.
What we can do is redirect our help pages to differently-named pages that are unlikely to be captured by Fandom; either a Help: page with a really distinctive title, or a "Project:" page. Checking the page history, we may be able to find our old material and take it over to our new page.
--- Robin Patterson (Talk) 03:17, 11 October 2021 (UTC)