Waiting room participant can see who is in Zoom session. How to disable?

[Psychodiver]

I had a zoom session this morning. I was host and had one participant. Near the end of the session I received notice that my client for my next zoom session was in waiting room. I ended with current client and admitted the next one. That client told me that while in the waiting room the screen name of the previous client was showing. (She told me the name and it was correct). I have never been told this before. I don't want person in waiting room to see who is in session before being admitted. How do I disable this? (I can't find any reference in knowledge base or on google.)