You can delete a user-defined user group for OneDrive for Business. You cannot delete the default user group.
Important: When you delete a user-defined user group, if jobs are scheduled to run on that user group, then those jobs are deleted.
From the navigation pane, go to Protect > Applications > Office 365.
The Office 365 apps page appears.
Click the OneDrive for Business app.
The app page appears.
On the User groups tab, select the check box of a user group that you want to delete.
Click the menu icon , and then click Delete.
The Delete subclient dialog box appears.
Type DELETE, and then click Delete.