Board Thread:Support Requests - Getting Technical/@comment-45310000-20200414001830/@comment-9605025-20200414012337

Pages in the MediaWiki namespace are system messages are are essential a way to use pages to set variables used by the backend. Other than the parsing as specified by the message documentation, no parsing it done for them. This means no wikitext and no HTML. The only way to style the local navigation would be through site CSS. Even if UCP wikis had site CSS, it would still be a violation of the customization policy to do so.