Integration Server preferences in Designer describe the connection to for Test Suite.

Designer always uses the active default Integration Server definition for Test Suite. Secure connection option in default server definition indicates whether the session will be opened through HTTP or HTTPS. In Designer, navigate to Window > Preferences > Software AG > Integration Server to add, edit, and update connection configurations. For details, refer the webMethods Service Development Help.

The editor does not always require an active connection to the test development. But some of the introspection features that allow service lookup and service signature are not available if a connection is not available and so, the user should enter them manually.