...
NOTE: If there are roles assigned to a Widget, then only Users with one of those roles can see the widget. If no roles are assigned, then any User will see the Widget. If a Widget has roles assigned, it will be indicated by the lock icon.
Home Page
The home page gives users the flexibility to create a new, or add an existing Widget to the active zone. While adding, removing, and/or rearranging Widgets, Users can use the 
button to return to the pre-save layout. Once the 
button is clicked, all previously made changes are committed.
...