PRS+ has a nifty feature called "Set New Flag Manually." You'll find it under PRS+ Settings > Book Management. Once it's enabled, when you have a book open and press the Options button, you'll be able to toggle the "New" badge on and off at will.
In other words, without PRS+, any newly loaded book has a "New" badge on it, but as soon as you open the book, even if only for one second, the "New" badge disappears forever. With PRS+, the "New" badge remains until you manually remove it using the Options menu. (And if you change your mind, you can always toggle it back on.)
Once you've set the "New" badge on or off on all your books, it's easy to see which books you've read. Also, all the unread books will automatically appear in the default "Unread Books" Collection.
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