To remove SharePoint/OneDrive Folders from your File Explorer (but not from the OneDrive cloud):
Click the OneDrive cloud icon in the bottom right corner of your screen, and then click settings:
From the settings tab, click “Stop sync” on the SharePoint/OneDrive folder you would like to remove.
**(This step insures you do not delete any files from the cloud, so it is crucial to make sure it is done)**
To make sure the sync has stopped properly, open the folder through your file explorer and make sure the “status’ column is empty:
Once the “status” column is empty, you can safely delete the folder from your File Explorer. It will still be available in the OneDrive cloud.