How to switch Speaker assignment?

I am running Zoom Basic on my Desktop PC which operates on Windows 10.

I was a participant in a meeting with one host/lecturer and 88 participants. When the host first opened the meeting, he was in the main window and the participants were in the gallery.  When any of the participants made a sound they appeared briefly in the main window. The host asked people to mute themselves except when they wanted to ask or answer a question.  I turned on Mute and never changed it from that point on.  I switched to gallery view to see how many people were attending.  The host/speaker appeared in one of the gallery windows. When he started the lecture, I switched back to Speaker view which showed me instead of the speaker. I could only see the lecturer in a gallery window in gallery view, even though he was the only person speaking.  At the very beginning, anyone who made a sound on mic appeared in the main window. Something changed to designate only me as the Speaker, even though it didn't start out that way.

I have searched for a setting that  said: "Designate me as the active speaker", but did not find anything like that.

I clicked on my window and the hosts window and clicked on whatever was clickable, but did not find anything related to speaker in either window.

Does someone have any idea what caused this or how I could have changed it back to a normal condition, where the person speaking appears in Speaker view?