Need ability to sort samples

Update - 7/24/17
It pains me to give this app anything less than 5 stars b/c I really love it but I have one problem with it that bothers me more and more. I need a way to separate books I own from samples and borrowed items. I read a LOT of books and it is extremely tedious to sort through old samples that I no longer need. Imagine looking through a physical library for a book to read and pulling out book after book that only had 5 pages of text. Frustrating right? But I still want those samples stored separately so when I want something NEW to read, I can choose from a list of titles that I have already previewed and purchase it on the spot. I hope the developers will seriously consider this request.
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I love the new page flip feature. It is especially handy for reading manuals or books that do not need to be read in chronological order. Amazon keeps raising the bar. This is my most used and most useful app.

Steelo703 about Kindle – Read Books, eBooks, Magazines, Newspapers & Textbooks, v5.12.1