From the top of the help page you linked to:
For a similar extension that doesn't require multiple pages, see Tabber.
Use of TabView is limited as Fandom intends to discontinue the extension. It is strongly suggested that your wiki does not add additional TabView code, and the feature is no longer enabled upon request.
With the migration to the updated software, Fandom disabled TabView except on a select few wikis which use it heavily. Even then, the intent of keeping it enabled was simply to provide more time for the wikis to convert their content to Tabber or some other alternative. The final goal was to eventually have all wikis no longer using TabView.