To stop syncing a library
Right click the OneDrive for Business icon in the Windows notification area at the bottom of your screen, and then click Stop syncing a folder…
NOTE If the OneDrive for Business icon isn't visible, click the Show hidden icons button in the notification tray.
Select the folder you want to stop syncing, and then click Stop syncing.
Click Yes to agree to permanently stop syncing the folder, and then click OK.
When you stop syncing a folder, the folder is disconnected from its library. All files are retained in the previously synced folder. You can sync the library to your computer again at any time. When you start syncing a library again, it will create a new folder on your computer. If it's using the same name, it will add a number to the end, such as 1, 2, and so on.