There might be a lot of reasons why you would like to delete your entire directory. However, there is no need to worry. Deleting an entire directory is really easy.
Step 1: Go to the “Contacts” page from your admin panel and click the “More” button.
Step 2: You will see the delete option on the screen, click on it.
Step 3: A confirmation text will appear on the screen, select “Delete Contacts” and you're done.
How to Delete a Member