You can choose to share :

• the entire screen;
• an individual application;
• an individual browser tab.

To share your screen, in the control bar, click the share screen button

In the “Share your screen” pop-up, select either

• Your Entire Screen, you will cast your complete screen to the meeting
• Application Window, you will cast a specific application to the meeting
• Browser Tab , you will cast a specific tab in your browser to the meeting

Do note that the “Application Window” option will only show applications that are currently not minimized.  Minimized applications won't appear on the list.

Note that, due to browser limitations, screen sharing is currently not working on Microsoft Edge and Apple Safari.