I'm pretty new, so maybe this is just my own idiocy...

It seems that when you click a title as having been read and it grays out with the little checkmark, there is no way to undo that selection. Is that right? The "Mark Book As" line disappears.

As I'm entering all my series info, this has already been a problem twice: once when my finger on a touchscreen hit the wrong choice by mistake, and once when I realized that I had not in fact read an early title.

Otherwise....I'm thrilled to find this site! Tracking series has been such a problem. One of the downsides of a Kindle is that I don't see book covers every time I pick up a book, so the images and titles don't seem to burn into my brain the way they used to.

The "Mark Book As" disappears only if you're viewing the entire series at once. You can change if from "read" to "not read" if you go the page of the actual book you're trying to change (click on title or image of cover.

I hope that solves your problem.

Somewhat arcane...but hey -- it works! Thanks very much!

Funnily enough, I found that this problem wasn't always consistent. As I was working through my series, I made mistakes a couple more times and found that I could make the correction right there on the series list in at least one other situation.