Index Numbers in Filmstrip You’ll now see index numbers in the filmstrip. They indicate the number of images in your collection of folder starting with image 1. If you dont’ want to see them, you can turn off the index numbers: right-click on one of the filmstrip thumbnails and select View Options >Hide Index Number. Likewise, if they’re turned off, select View Options>Show Index Number to make them appear.
Thank you so much!
It's found here: