I don't think that this behavior has changed, but looking at Concerto data it looks like it is listing all of the branch level holdings alphabetically by branch and then listing Sub-branch level holdings after that. Screenshot attached (in this example, Example Bookmobile 1 is a sub-branch of Example Branch 3).
I don't think that this behavior has changed, but looking at Concerto data it looks like it is listing all of the branch level holdings alphabetically by branch and then listing Sub-branch level holdings after that. Screenshot attached (in this example, Example Bookmobile 1 is a sub-branch of Example Branch 3).