But an existing album that was not using fixed shape thumbnails will now display the thumbnails considerably larger unless the image bounds are reduced by one-quarter to one-third.
If your project had 360x240 thumbnails, and it does not use fixed shape thumbnails, resetting the bounds to 270x180 will approximate the layout of the existing album. These changes will involve at least one reprocessing of all the images in an existing project, unfortunately.
If you are modifying an existing Neptune project, and change to fixed-shape thumbnails, the thumbnail image bounds should be checked before making an album.
For justified thumbnails, high aspect ratios work best, like 1000x250. But for fixed-shape thumbnails, more normal thumbnail image bounds should be chosen, like 300x200 or 180x180.