Is there is a way to remove or disable the standard login box in Liquid Files and only allow the SSO Login method.
Depending on your available CSS and JavaScript capabilities are, this may or may not be possible. You would have to create a custom stylesheet and/or custom javascript. Please see: https://man.liquidfiles.com/branding/stylesheet_and_javascript_overrides.html for more information. On a side note, you may want to update to LiquidFiles v3.5.5 or later (Admin → System → Update). In LiquidFiles v3.5 we've added a setting in Admin → Groups where you can force a group of users to use SSO Login so removes the need to remove the login field.