How to properly switch from Co-Management to Full Intune?

Hi Guys,

Intune newbie (and Microsoft platform altogether) here. We have a SCCM + Intune co-management configured setup (Cloud Attach) in a Hybrid AD environment that has Windows 10 and 11 devices in the mix (Intune capabilities are not yet being used). We're gradually trying to move out from SCCM by transitioning the workloads to Intune. 

My questions are:

1. if we implement the following workload through Intune, when exactly are we supposed to change these switches to 'Intune' side from co-Management ?

2. What exactly Pilot-Intune' mean here? Wondering if these switches are actually affecting the devices or not.

3. If we don't change the switch to Full Intune, what would be the behaviour ? Which one takes the precedence (Intune or SCCM ?) ?

3. If everything is proven to work through Intune, what steps are required to safely decommission SCCM from current devices ?

Really appreciate your insights !

Thank you

Kev