Remove an API from the Unified Schema
You can remove APIs from the unified schema as needed. For example, remove an API to add a new version, or remove an API if the underlying REST API no longer exists.
However, be aware that when you remove an API from the unified schema, you break:
Any merges and links with the types in the API schema that you remove
Any existing queries that query the types and fields of the API schema that you remove
To remove an API:
Click List of APIs added and select the API that you want to remove.
Click Remove API, and then click Apply Changes.