How to delete a group category and/or delete a group assignment from a contact record
Removing a group category in the view groups screen simply removes the group category and removes the group assignment from any contact to whom it is assigned.
To delete a group category, simply go into Groups (hover) → View Groups (click) and choose one of the two options described below.
Mark any checkbox to the right of the group you want to remove and click the Remove Groups button at the bottom.
Or, click the remove icon to the right of the group.
Remove a group assignment from a contact
To remove a group assignment from an individual contact, simply pull up the contact's dashboard and click the remove icon to the right of the group.