Login window when saml2=disabled

We are an environment of BI 4.3 + SAP NetWeaver Application Server Java.

I configured SAML by referring to https://launchpad.support.sap.com/#/notes/3086468 and the administrator's manual.

1. Configure NW + Idp SAML

2. Configure NW + BO trusted authentication

After configuration SAML SSO will be successful

However, in order to access the classic BI login window, if you add the saml2=disabled parameter to the URL and access it, the NetWeaver Application Server Java login window appears instead of going directly to the BI launchpad.

Please help if there is a way to set it up