App Hub
The App Hub is a repository where all published and activated App Builder apps are stored. For end users, this is the user interface to access the App Builder apps that they are authorized to use. Authorized apps display in a menu on the left side of the window. If the menu is not already displayed, click the "hamburger" icon at the left side of the menu bar.
The App Hub also hosts the runtime and administrative functions of App Builder. App Builder administrators can perform administrative such as assigning user roles (permission groups) and activating apps in the App Hub.
The App Hub internally handles all navigation and the distinctions between users and administrators.