Developer Portal exposing target server address?

[#1]

I am learning Apigee basics.

I created a simple API spec pointing to a target server.

Its API proxy is working as expected.

However I generated a developer portal and it is exposing my target server (1.1.1.1) address like this:

HTTP request: http://1.1.1.1:8080/v1/at2/node/{nodeId}/backend

I was expecting that it would show only the proxy endpoint, not the target server endpoint.

I mean, shouldn't the Portal show this instead:

HTTP request: https://evertonmarques-eval-test.apigee.net/api-proxy-name/at2/node/nodeId/backend

How can I hide the target server address from the developer portal?

Everton