You can share your screen in a session as long as you have permission. If you don’t see the screen share icon, you don’t have permission.
Share your screen
When sharing you will only see Publishing Your Desktop. Everyone else will see what you are sharing.
If you are sharing a video with audio, you must select a Chrome tab, and check the ‘Share audio’ box in the lower-left corner of the dialog.
Click on the Share Desktop icon in the lower-left corner
Select the appropriate tab along the top: Your Entire Screen, Application Window, or Chrome Tab.
Within each tab, you will have options for which screen, application, or tab to share.
Select the desired option and click the share button.
End screen share
Click on the Share Desktop icon again to stop desktop/screen sharing.