Currently, when using Publishing Services in Lightroom Classic, there is no way to tell which Publishing Service contains unpublished images.
For example, I have many collections within the Flickr publish service. If I want to make sure they are all up to date, I need to click on each one in the left column of the Library module and, then, look at the grid to see if there are new photos or modified photos to be published.
It would be better if Lightroom Classic could automatically show me which collections need to be updated. This could be accomplished by the software adding some kind of indicator graphic or a color label (red, maybe) to the collections containing unpublished photos.This way I can quickly see which ones need updating.