Hi, there is no option in the Fleet UI for disabling password-based authentication.
However, I believe users (and admin users) that have SAML SSO turned on in Fleet will not be able to log in via password-based authentication.
With SAML SSO enabled, the login UI still displays the “Username” and “Password” fields but on attempted password-based login, this user should receive an “Authentication failed” message. Please let me know if you’re observing a different behavior.