Board Thread:New Features/@comment-37567282-20190103043150/@comment-9605025-20190103050912

I see. So this is a Community Builder feature. Unfortunately, Community Builder is in such an early stage that it isn't even considered to be "in testing" yet (source). As far as I know, there is very little, if any, documentation on it. Your best bet is to ask some admins of wikis that are using Community Builder. If you can't do that, ask staff.

Some other threads about Community Builder:
 * Thread:1546057
 * Thread:1546328
 * Thread:1550051