If the SFC Protect is expired/disabled on the device, the option will be greyed out, and the associated “Traffic Steering Priority” rule(s) will be removed from the system.
In your case, the client device(s) defined in SFC Protect page will follow whichever rule in out Outbound Policy page that is applicable, eg. the “Default” rule.
Probably this article should be able to address the auto-renewal question.