All groups are now sorted from small to large, or large to small (depending on whether you sorted by ‘ascending’ or ‘descending’).
The dimensions of the photos can be found above each group (see highlighted in red).
This way you can quickly see if your photos are suitable for inclusion in the photo book.
Photos with a size smaller than 1200×1600 are generally less suitable for inclusion in the photo book or will only be displayed in small size.