We have prepared instructions for sharing your content in meetings in Microsoft Teams.
Show your screen during a meeting
Look at the bottom of Teams meeting window.
Select Share like in the image below
Select what you want to share: Desktop lets you show everything on your screen. Window lets you show a specific app. PowerPoint lets you show a presentation. Browse lets you find the file you want to show.
After you select what you want to show, a red border surrounds what you're sharing. Select Stop sharing to stop showing your screen.