Board Thread:Support Requests - Designing Your Wiki/@comment-35289850-20200816195002/@comment-9605025-20200816223450

Fandom cannot disable the use of CSS properties. Well, unless you are using inline CSS. Then the MediaWiki parser can filter them out. However, I don't see a reason why they would prevent "position: sticky". My assumption would be either than some other CSS is messing with it or your browser doesn't support it.