You're right Chip.

Actually it is the preview screen for any theme, but it also has the customizations for each theme. I guess that's why they call it "Customize". ;-)

You can make changes to the selected theme and click "Refresh" to see those changes, but nothing is permanent until you click on "Save".

And there is also a button to hide the customization column so you can see the preview in full screen.

I can see more things showing up in the customizations column in the future.

Looks good to me.

Ron