The top 2 windows here are synced together, and I don’t want them to be:
Changing one changes the other. Ungood. 
How does one UNlink, UNsync them?
tnx
That is not windows that are synced.
That is object mode that is global.
You can differentiate display in both 3D Viewports.
But active object can not be in 2 modes, at same moment.