This tab contains the definitions of the method/endpoint and data types of the selected API Proxy. API Definition File of an API Proxy that is deployed for use is created at runtime using these definitions.
The content and usage of the Design tab is the same as the Spec Designer interface, except a few details is not displayed in the Overview section.
The Design tab is only available for API Proxies of Swagger 2.x, OpenAPI/Swagger 3.0.x and No-Spec API type.