Image Thumbnailsfilter which previously allowed one to see the SERP listings for which Google included also images alongside their titles and descriptions has been revamped and split into 2 standalone filtering options:
Single Image Thumbnailsand
Multi Image Thumbnails.
Single Image Thumbnails
When applied to the report, this filtering option will show the SERP listings accompanied by a single thumbnail image.
Multi Image Thumbnails
When selected, this filtering option will show the SERP listings featuring a group of thumbnail images.