In Microsoft Teams, you can show your desktop, a specific app, presentation, or any file while in a meeting.
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Select Share .
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Select what you want to share:
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Desktop lets you show everything on your screen.
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Window lets you show a specific app.
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PowerPoint lets you show a presentation.
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Browse lets you find the file you want to show.
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After you select what you want to show, a red border surrounds what you're sharing.
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Select Stop sharing to stop showing your screen.
Source: Microsoft