Thanks both. In corporate environments we've seen more software developers who have a Mac with multiple screens (often one of them vertical for code) than with just one. But we were unable to find any reliable stats and it's an ongoing debate in how far multiple screens (vs. just hire resolutions/more pixels on one screen actually improve performance - see https://lifehacker.com/is-the-multiple-monitor-productivity-....

In any case, CoScreen also works great with just one screen and you can share/unshare with a single tap of a button.