How do I enable the start-stop function on a 2017 Jeep

I'm sorry, I'm not sure what you mean by start-stop function. Honestly, any kind of manual disconnection and reconnection on a vehicle with CAN networking these days could lead to many different issues. You'll likely need to seek local guidance from a technician. https://repairpal.com/repair-shops/jeep-repair-and-service-in-ruskin-florida