I'm sorry, but according to the available knowledge sources, it is currently not possible to delete an identity schema in Ory Network. There is no REST API or UI option to remove identity schemas. This limitation has been acknowledged by the Ory team, and there are open feature requests from the community to add this capability in the future. For now, unused schemas will remain listed, and the only workaround is to ignore them or create new versions as needed. The Ory team has mentioned the possibility of providing an option to "forget" schemas in the UI, but this is not yet available [Allow Identity Schemas to be deleted](
https://github.com/ory/network/issues/262) [Unable to select custom Identity Schema](
https://github.com/ory/network/issues/54).