Logitech Brio not HD in Zoom on MacBook Pro 16 M1 Max OS Monterey

I have this issue too, and have found a temporary workaround completely by accident. As I was trying to figure this problem out while in Zoom I happened to check out FaceTime and noticed it would correct the Zoom image.

1) Have Zoom open and your external webcam active.

2) Open an app that uses the external webcam, such as FaceTime or Photo Booth.

3) Swap between the MacBook's built in camera and the external webcam.

4) Go back to Zoom.

Apparently, activating HD in another app seems to give Zoom a kick in the pants. I say this is temporary because if you turn off your camera you have to repeat the process.

Add this problem to the USB-C hubs not working and Calendar being incredibly slow when using Exchange accounts and I am now following 3 different bugs that have all cropped up since "upgrading" to Monterey. I deliver online training for a living. The Zoom issue is not insignificant to me. I may have to reinstall Big Sur.

Change cable between Logitec and Mac Book Pro, OS Monterey. ( Apple-cable)

I had the same issue when i updated to Monterey. Cam would not work, but i was using Chrome. I switched over to Safari and it worked perfect.

Even if you have a 4K camera when you are doing Zoom or any online conferences the quality of the video will drop to adjust to web traffic.

Zoom has a whole support website:

https://support.zoom.us/hc/en-us/articles/115002595343-Improving-poor-video-quality

I don't want to add any side apps. And from what I can tell, the use of that app is not persistent anyhow. So you still need to tweak the camera every use.