Why the contact icon in the left pane is not showing up?

Why the contact icon in the left pane is not showing up?

Left Pane

Left pane has the compose button, Folders, Archive Folders, Labels, Views and Contacts. You can drag and drop folders in the pane to move them. The bottom of the Left Pane has links to various POP accounts configured in ZOHO.

This is what I read from the help. So I have noticed that I only do have 

Folders, Archive Folders, Labels, Views
while Contacts do not show-up anymore.
Did I miss something or is it a bug?

Regards,