MS Teams - Share Your Screen In a Meeting
Goal:
Provide instruction on how to share your desktop in a Teams meeting
Desktop:
Desktop sharing lets you present your screen or the app you're using during a meeting. To share your screen in a meeting, click Share 
in your meeting controls. You can choose to present your entire desktop, a specific app, or a file.
Share PowerPoint slides in a meeting
If you choose to share a PowerPoint file in a meeting, rather than your desktop, meeting participants will get some special capabilities:
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They'll be able to move around to different slides without interrupting the main presentation.
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They can sync their view back to the presenter's view with one click.
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Click Share
in your meeting controls. -
In the PowerPoint section, click the file you want. Click Browse to look for a different file.
Notes:
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The PowerPoint section lists the most recent files you've opened or edited in your team SharePoint site or your OneDrive. If you select one of these files to present, all meeting participants will be able to view the slides during the meeting. Their access permissions to the file outside of the meeting won't change.
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If you select Browse and choose to present a PowerPoint file that hasn't been uploaded to Teams before, it will get uploaded as part of the meeting. If you're presenting in a channel meeting, the file is uploaded to the Files tab in the channel, where all team members will have access to it. If you're presenting in a private meeting, the file is uploaded to your OneDrive, where only the meeting participants will be able to access it.
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Mobile:
For now, go to the Teams desktop app or Teams on the web to share PowerPoint slides in a Teams meeting. Once you've joined a meeting, you'll be able to view slides and take control of the presentation while using your mobile device.