To sort the photos, tick the checkbox next to "Filter". This will open a drop-down box where you can set the criteria by which you want to sort the photos:
by the file creation date
by the photo upload date
by filename
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If you choose to sort by the file creation date, you can optionally segment photos by day, month, and year. To segment photos by month, simply click "month" in the drop-down box. A screenshot below shows how the photos are sorted by month.
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The same principle can be used to sort photos in alphabetical order or vice versa from Z to A. This feature will be useful if you sign your photos, for example, "Summer. Italy" or "Rafting on Cheremosh", instead of leaving the name "img 242535" assigned to the photo automatically by your camera or phone.
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The photos you used in the book are highlighted in green.
If the photos you have used already confuse you when creating a book, use the "Hide Used Photos" feature. To do this, simply check the box next to this option in the drop-down box
Photos you haven't used yet will not be highlighted.
The photo you are currently handling will have a yellow frame.