A Microsoft file hosting and synchronization service.
Hi MenoraTse,
Welcome to the Microsoft community.
To unsync your Documents folder go to the OneDrive Settings > Sync and backup > Manage backup and toggle the Documents folder to OFF.
The "Choose folders" settings allow you to keep online folders from downloading and syncing to your computer. De-selected folders are removed from your computer and remain online only. The Documents, Desktop, Pictures, Music, and Videos folders cannot be online only and therefore cannot be de-selected.
I hope that helps. I'll try to help with any questions you may have.
Best regards,
Craig