any way to mark ALL old posts read? - eviltoast

I have “mark read when scrolled past” turned on. And now I have (1) posts within the past day or two, and (2) posts older than a month (since I joined about a month ago).

Is there any way to mark ALL older posts read? It’s weird because I’ll be reading a post from a few hours ago, and then suddenly be reading news from a while ago, and I’m sick of hearing about the old news.

Thanks!