The "view all" button would take you to the Admin > Variables page. This page normally requires a Admin_ConfigureBuildMAster permission, but if you have the Manage Application permission, you will be able to see variables accessible to the application scope.
This means server, environment, etc. However, you would not see variables from other applications or other application groups. And you could only edit Application variables.
In principle, this could work like the `ListSecureResourcesPage` with an `applicationId=` argument, and
* display the application navigation instead
* no filtering -- just show all variables accessible in the scope
* hide edit link for all except application variables