This requires to have the JSF UI addon installed on your server.
Nuxeo Multi-tenant enables to have domains, or tenants, that are independent from each other, with their own users, vocabulary values etc.
Installation
This addon requires no specific installation steps. It can be installed like any other package with nuxeoctl command line or from the Update Center.
After you've installed it, a tab Tenant isolation is available in the Admin Center where you can enable or disable the tenant isolation.
Related Documentation