I use "Advanced Screen Share" for this purpose. it has a one time purchase if you want to remove a small overlay but it gets the job done and is installable through the app store.
Wasn't the same thing posted for MacOS a few days back, can't recall the name? Looking at the time on the repo makes me think the author pushed after seeing people requesting something similar for Linux.
That's not quite the same. With DeskPad you have to move the window to the virtual monitor. clipscreen allows you to select a portion of your screen without moving any windows.
you can just share multiple windows on the newest macOS and they will ne nicely arranged for viewers. You can even add the presenter thing to show your face next to them.