Ah! That makes a lot more sense, thanks, I didn't spot that.
(In case Plausible people are here: I found it a lot more obvious on the desktop site, in fact when I saw it there I thought 'oh it just doesn't show the filter on mobile', but then when I switched back saw it does, I just hadn't noticed it.)
good point, thanks! we had to shorten the top menu on mobile devices to fit all the important stuff so you only see "X filters" rather than the full filter as on the desktop
(In case Plausible people are here: I found it a lot more obvious on the desktop site, in fact when I saw it there I thought 'oh it just doesn't show the filter on mobile', but then when I switched back saw it does, I just hadn't noticed it.)