Strategy Library supports multiple authentication modes, as such:
Multiple authentication modes can be enabled simultaneously. In that case, the user will always be given the option to select the authentication mode by showing a login mode.

It is not possible to select a default authentication mode. If users should be logged in without showing the Strategy Library login page (through Single Sign On authentication modes such as Integrated authentication), then only Integrated authentication must be enabled and all other authentication modes be disabled.
Note: When using the new seamless login feature between Strategy Web 10.11+ and Strategy Library 10.11+ (Seamless Login: New features available with the 10.11 MicroStrategy version ), users will not be shown a login page since the session will be created seamlessly from the original session in Strategy Web.
Article Reference Number: KB441461