This is a serious issue with the massive increase in video calls and screen sharing (and people being oblivious to or not caring about this). Not just chat but also email notifications with previews. This has become something I actively consider before communicating by text instead of calling someone.
It would be great if teams, zoom etc could automatically and by default prevent any notifications from popping into a shared screen.
And then there’s still the people who leave their mail and chat opened and just cmd-tab through them or leave them on screen while sharing... oh well :)
FWIW, OS X has a do not disturb toggle for this very reason. It's slightly hidden, but easily found with Google. That many people don't bother, is just how people are :/
