@Mikitos there were some missing data attributes on some templates (which that theme component uses to hide muted categories), so I have a fix for that in this commit.
https://github.com/discourse/discourse/commit/9101227266c0d5dc07a15f017e176e00e9da262c
Additionally, we decided to try demoting muted categories to the bottom of the list if you do want to keep them viewable. Should be available on tests-passed as soon as checks finish.