Board Thread:Support Requests - Designing Your Wiki/@comment-39688405-20190604005645/@comment-9605025-20190604013034

I am going to guess that you have "Community Feeds" set as your landing page in Special:Preferences and are seeing a link to the "Home Page" in the wiki navigation bar, correct? Change your landing page to anything but "Community Feeds" and it will show you "Forum" in the navigation bar.

This happens because of Wikia's quick fix for a related issue. Users have already made suggestions how to improve it further but Wikia seems to have not moved forward with them. - Edit:

Here is the technical update thread regarding the change.