[square_usual]

Try sharing only a single display of your multi monitor setup on X11. Try sharing a screen at all on Wayland ;)

E: Realised "sharing" would be ambiguous - I mean screen sharing on video calls, etc.

[vetinari]

Sharing single displays or specific windows on Wayland is easy - Chrome and Firefox, or app like OBS can do it; if your conference app cannot do it, ask the vendor why.

[pferde]

Here's an anecdote: sharing a single X11 display on my two-display setup works just fine with Microsoft Teams, I use it almost daily.

That Linux MS Teams client can only do read-only sharing (no giving control to remote party) is another matter, which bothers me a lot.