OK. I'm a little slow sometimes. I just checked another App and the list of Providers is under 100 so does allow you a choice. I'm guessing that's about the limit. I guess that's one of the reasons I get frustrated with the new QB. In the old version you can filter by Provider in the report I was talking about. It's a bit more laborious but doable. I'll advise my co-worker who requested the change to switch to old version while running the report as long as it's available.
Thanks so much for your help and support. It was driving me crazy that I couldn't figure a way to do it!