There is an Edge SWG (ProxySG) WAN optimization feature called Application Delivery Network (ADN).
This feature can be seen on Edge SWG hardware appliances but not on the virtual instances of the Edge SWG.
This is by design and is expected behavior because ADN is not supported on Edge SWG virtual instances. It is only available on Edge SWG hardware appliances.
On SGOS version 7.3 ADN is no longer supported on the hardware appliance and virtual proxy.
SGOS version 7.4 and later removed ProxyClient and ADN commands.