In dual folder view now seems to bridge the two view

As of my last restart due to Windows update my dual pane folder/file view seem to have both panes linked.
Meaning when I change one side to a directory/folder the other side shows the same. No clear on how to make them separated again.

A screenshot which doesn't crop out the toolbars will probably reveal you have clicked the Navigation Lock button, which does exactly that.

Full picture of the listener.

As I suspected: