Auto-Redirect on Login
By default, users who reach Cortex while logged out will see a screen prompting them to click through to the auhentication provider. If you would prefer them to be redirected automatically, there is a setting for this.
This redirect also applies after a user's session times out.
Option 1 - System Settings (UI)
In Cortex, navigate to Admin > System Settings > Authentication and check the box for Auto-Redirect Users To Log In.