Board Thread:Support Requests - Getting Technical/@comment-44141160-20200113201439/@comment-9605025-20200113201736

Your second link is to a category page. I would advise against trying to compress a category-page-sized list into a navbox. However, if you really want to do it, you can use DPL. If you haven't previously done so, you will need to and request that DPL be enabled for your wiki. - Edit:

Also, it is generally discouraged to use DPL in a template. However, that would be the only way to accomplish what you are asking for.