SAML20 module: how to set the sign out button behavior?

We are using the SAML20 module and our application has a default sign out button. Clicking the button leads to https://mourikapp-accp.mendixcloud.com/login.html. Furthermore, after signing off in this way, if the user then exits the app and starts it again, he is logged in automatically. Desired behavior: I'd like the user to be directed to the ADFS login page again after he logged in via SAML (ADFS) and then clicked the Sign out button. I did set the constant SAML20.DefaultLogoutPage to /SSO/ but that does not seem to have an effect. Any help would be greatly appreciated.