Missing Domains Options in kolab-webadmin

I am attempting to add a child domain to my setup and the docs I can 
find tell me to log into the web admin and click "Domains".  
Unfortunately, that is not an option because I only see: User, Groups, 
Roles, Resources, Shared Folders, Utils, Settings, and About.  No 
Domains option.  Is there something I need to configure?

This is on Ubuntu 18.04.

Thanks,
Eric