UserManagementSubsystem - Session Management Settings - Idle Session Timeout

The UserManagementSubsystem has Session Management Settings where we can set the "Idle Session Timeout (min)". My use case requires redirecting the user to the login mashup screen when the idle session timeout expires. As far as I can tell, I don't see the redirect URL to configure the same in ThingWorx. Could you please share the code snippet for this scenario?

In ThingWorx, even though the mashups are active, the session expires when the session timeout is reached. Does ThingWorx behave this way by default? I want to implement the timeout in such a way that only the session expires if the system is idle for the set period of time.

Thanks