Thank you for letting me know, glad I was able to help!
It sounds like you will need to set the Allowed Logout URL on the application level in order to redirect the user after logging out ( post-logout). There could be other factors at play here, but this is a safe first step to check.
Just leaving this documentation here as well in case it comes in handy : Log Users Out of SAML Identity Providers → it goes over how to set up SLO ( Single Log Out ) in case your application supports it. This would end the session and log the user out of all the applications connected to the same Connection, with a single Logout action.
Let me know if setting the Allowed Logout URL solved the issue for you and if not, we can further look into this.
Best regards,
Gerald