It's hard to know when a colleague might IM you while you're screen sharing - follow these steps so you don't get caught sharing those messages come in you'd rather your audience not see...
These steps are for screen sharing in Zoom.
1
In Zoom. Click "Share Screen"
2
You'll see options to share your entire screen. They'll be numbered "Screen 1" and "Screen 2" if you have multiple monitors.
Only share your screen if you know your IMs will pop up on a different screen!
3
INSTEAD, scroll down and click the specific window or application you want to share - like the Google Slides window.