I've looked in help but don't see it.
Here's a screenshot with the file selected and the cursor pointed to it.
Thanks
Stack Counter. You are working with stacks.
See Creating a Stack (https://www.photools.com/help/imatch/#rel_stacking.htm?dl=h-3)
Are stacks created with versions? All the images with stacks are versioned. I don't believe I created them on purpose (I have several). I certainly could have in error though.
I can't seem to delete them or view them in Panels/stacks. They all have the stack counter but no stack indicator.
Thanks.
Masters and Versions automatically build a stack.
See Version Stacks (https://www.photools.com/help/imatch/#rel_versions.htm?dl=h-7)
That explains that. Many thanks.
Tip: Left-click the Stack Counter to open the context menu.