Unable to stop sync specific SharePoint Document library

Sreevalsan 

To stop syncing a specific SharePoint Document Library, you can follow these steps:

1. Click on the blue cloud icon in your computer’s taskbar to access OneDrive for Business on your computer.
2. From the pop-up that appears, click on “More”.
3. From another pop-up that appears, choose “Settings”.
4. On the next screen, you will see a list of all the places you synchronize. Most likely you will see your own OneDrive being synchronized, plus any SharePoint document libraries you pressed sync on.
5. To un-sync, just click on “Stop Sync” next to the location you want to stop synchronizing.
6. You will then get a confirmation message; just press “Stop Sync” button.
7. Press “OK” – you are all set. You will see the green checkbox (that you normally see appear over the yellow folder) gone – meaning there is no more synchronization in place and no link between SharePoint document library and your computer.

I hope this helps!