Hi Jean,
To stop the Desktop folder from being synced to OneDrive, please do the following.
- Open OneDrive settings via the taskbar notification area.
- Click "Sync and backup" and click "Manage backup".
- Deselect "Desktop".
- Click Save changes.
For more information and screenshots, please check out the following guide.
Turn On or Off OneDrive Folder Backup Syncing Across Windows 11 Devices | Windows 11 Forum***
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