Head over to "Advanced" on the panels.

The only thing you should change here is "FeatureUnlock." This fancy thing allows some of the newer things that old Macs can't do (Like AirPlay to Mac, Universal Control, Sidecar, etc.)

If it is set to "Partial" by default, that means you will get Night Shift, but nothing else. Your Mac must support Continuity in order for "Enabled" to actually give you these functions. If your Mac does support Continuity, but you have RAM issues later on, set this back to partial.