1. In a meeting, click Share content (rectangle with arrow) in the meeting controls
2. Choose what to share:
• Desktop: Share your entire screen
• Window: Share a specific application
• PowerPoint: Share a presentation
3. Click Stop sharing when finished

Tips for screen sharing:

• Use Include system audio to share computer sound
• Give control allows others to interact with your shared screen
• Blur background or use Custom background for privacy

For more details, see Microsoft's guides:

• Screen sharing: Present content in Microsoft Teams meetings