Sign in only when accessing Edit Widget

I have a secured map service with feature capabilities. I want all users to be able to see the service read-only when they visit the application and only be prompted for credentials if they click on the edit widget.

As it is now, when I add the service to the application builder as an operational layer, all users are prompted for credentials as soon as the page loads. Is there a way to set-it up as first described?

Thanks!