Ldap + saml authenthication (environment variable) user login menu

Under nextcloud 14, with user_saml plugin
I am encountering a problem to activate two authentications:

  • ldap
  • user_saml via environment variable (shibboleth sp)

When I activate user_saml (via environment variable) no parameter to define an alternate menu of sso authentication (as in previous version).

saml authentication via shibboleth service provider and environnement variable works well, the only problem is that the user cannot choose between ldap or sso authentication.
We have to activate either one or the ohter.

Is there a parameter that we can put via php occ command or directly in the database.

Thanks for help.