In Microsoft Teams, it is now possible to share your screen in a chat conversation. Before, you needed to be in a call with someone before you could share your screen.
In an instant message conversation, choose the Share Content button, and select the Desktop or Window you would like to share. Teams will ask the person or people you’re chatting with if they’d like to accept your content. Whatever you choose to share will be outlined in red to remind you it’s being shared.
Choose the Share Content button again to bring up the Screen Share Session.
From here, there are three ways to stop sharing your screen. From the Microsoft Teams client, you can always press the Stop Sharing button to stop sharing. If you click away from the Teams client, you will see the Call Options Menu, and you can choose the Stop Sharing button here as well. The last way is if you are sharing your Desktop, you can move your mouse to the top of the desktop to see the toolbar. From here you can choose Stop Presenting.
This will end your screen share session.
And that’s how you share your screen from a chat window with Microsoft Teams.