[Feature Request] Ability to change the FAB (floating action button) to a "hide read posts" button

Rather than permanently hide all read posts or not at all, it would be nice to be able to hide them when needed. Refreshing posts or navigating to a community could load all posts.

I find turning on "mark as read on scroll" and "hide all read posts" too aggressive in its current state. Mark as read on scroll + a button to hide when needed/wanted would be much better imo.

And if posts that are scrolled past or images viewed could also be greyed out (like when clicking on comments), that would be fantastic.