This blog post is about the situation where after upgrading to the latest macOS version 10.15 – also known as Catalina – you may not be able to share your screen content.
All that will show is your background…..
Click the Apple in the upper left hand corner of the screen > System Preferences > Security & Privacy.
Click the Privacy tab at the top of the dialog box.
Scroll down on the left hand side of the screen to Screen Recording.
Check the box next to GotoMeeting.
You will be alerted to quit GotoMeeting before the change can take place.
Then re-start GotoMeeting. You will be all set to now share your screen.
Do that and you’re all good – note this might affect Skype and Teams – so follow the same procedure there.