Identifying controls in 2023 Organizer window

Want to know what is a "version set"?

The home screen is there to help you. Type those words in the text entry  space on top of the dialog. You get a number of thelp docs about what you are searching.

Other ways to search Adobe's docs: in your preferred search engine, type "docx; " followed by the words you want to search.

Version sets are special kinds of stacks, they are the babies of a parent image, the different versions. As stacks only show the 'top of stack' hiding the children in the stack, you can't see those without expanding the stack, which is done with clicking on the right pointing arrow. A left pointing arrow does stack again, hiding all stack or version set members under the top of stack.

Note; to be able to clearly see those types of icons, better use the "detailed view" rather than the default one displaying the thumbnail without the filenames and dates. Shortcut to switch between both: Crl D.