The “What’s New” page for XD (June release section) mentions these features for this release:
Share Online support for enterprise
Enterprises can now share their prototypes securely with team members by accessing Share Online services.
Enterprise dashboard management
Control and protect creative content and design assets by deploying tools through the Adobe Enterprise Dashboard.
I am not able to find any further information about these new features and have yet to be able to discover them in the application, itself. Is there any more information about these?
If your organization has has an enterprise account with Adobe for Creative Cloud with services, then, your IT administrator has a dashboard with options to turn certain services off for the organization (often for security reasons). These services include Creative Cloud services like using Creative Cloud for storage, Behance access or Typekit. The option to turn off the XD Share Online feature for an organization was recently added to enterprise dashboards that IT admins control.
This feature isn't something that individual users will see.
We are working on changing this description to make it more clear to users.