Camera not working on Studio Display for Zoom with an attached Macbook
There was another question that hadn't been answered in awhile on how to get Zoom to work on your Studio Display if you have a Macbook attached. I've figured it out. When you open Zoom in your Studio Display, go to the carrot (^) button on the Stop / Start Video icon on the lower left, click it and switch video option to Studio Display. Then, do the same with the mute button for your sound (you'll need to confirm both the microphone and speaker are Studio Display). Hope this helps.
Studio Display