Muting a topic works as intended on my pc. So far so good. However, on my mobile browser the topics are still visible under their respective categories on the forum’s front page. If you go into a particular category, the muted topics are once again properly invisible.
It’s not the end of the world, but it does clutter up a bit of real estate.
My issue is this: Real estate is limited on a mobile screen, so if a muted topic shows up on the front page, it’s edged out at least one topic that might have been of more interest than the one I explicitly had no interest in. Though like I said: it’s not the end of the world, and certainly nothing I would ever go to the barricades for. Just an oddity I noticed.
ETA: I’ve used different defaults for the forum front page (category, latest, etc.) with the same end result.