To delete a Group, follow these simple steps:
Step 1: To delete a Group, go to ‘Contacts’ > ‘Groups’
Step 2: Click on ‘Edit’ on the right-hand side of the Group you wish to delete.
Step 3: Click on ‘Delete’ at the bottom of the pop-out window.
Contacts in this group will be removed, if they were in no other category/group, they will appear in ‘Contacts on Master Contact List but not in a group’.