We have turned off the built in Portal as an Authentication source in the CAS and added our own custom IDP for login under Identity Providers. We have published this to the IDR successfully. When we login we get correct behaviour between the Portals but on logout we get taken back to the IDR Portal Authentication Source even though we have turned this off. We need to go back to our custom IDP but cannot see anywhere to specify a custom logout URL. Is this intended behaviour because it is just confusing to users?