Xcode Key Bindings Configuration Does Not Work

Once you have selected the Move Focus To Next Area line, press the delete key to return to the default assignment, and then change the Key again.

Usually, the key set in Move Focus To Next Area with Shift is automatically assigned to the key in Move Focus To Previous Area, but I don't know how to reproduce it, but it seems that both keys are assigned at some time.

Once you reset it to the default setting, the same key was reset.

If assigning your preferred keybind is the top priority, you can also configure the keyboard shortcut from the system configuration in OS X.

You can use the Navigate->Move Focus To Next Area or Navigate->Navigate->Move Focus To Previous Area keys by selecting the application in the left pane.