Same here, I've found a single (not too big) monitor to be best for ergonomics.

Still keep a second monitor around, but it's exclusively for screen sharing. Speaking of, having a dedicated monitor for sharing is really nice:

- It can have a standard resolution and aspect ratio (1080p) which is perfect for sharing

- It is a clean slate. I only share stuff I consciously move to that monitor. No need to clear my screen or burden my colleagues with unrelated windows in our call.

- Yes app sharing exists, but screen sharing is just more reliable and works better for sharing multiple things sequentially/simultaneously.