Here's a video showing the issue:
I did some web searches and this camera is popular for streamers, so the answers I saw were frequently about how to do this with OBS. It appears that it's just a software setting and has nothing to do with hardware.
macOS 10.15.1 (19B88)
RingCentral Meetings version: 19.4.151912.1206
Webcam: Logitch HD Pro Webcam C920