You move Documents folder or move the location of OneDrive. Suddenly the Documents Folder is duplicated on the left side of navigation.
The problem happens because enumerator problem on the Windows 10. This can't be avoided for some PC
- On the File Explorer, open View Tab
- Click Options
- Go to View Tab
- On the Navigation Pane Category, select "Show All Folders" or unselect it if its already selected.