Ask for only password if the okta session is alive in SAML for Force authentication

When i use “&prompt=login” to force auth in the URL of OKTA OIDC login and if earlier session is alive, in the login ui only password is prompted.

In case of SAML i used ForceAuthn= true, But this asks for both username and password if last session was alive. How should i configure so that it asks only for password?