Does anyone know how to make the web version of Mastodon display ALT text as mouseover which it used to do?

It now (since an update, probably last year) makes me click on the little ALT and then the ALT text is in an annoying hovery box which is less good at displaying long text and requires a click. Some update seems to have changed it ages ago and i really want to revert it.

Is it a server specific thing? Any advice appreciated.