Thanks that worked.
But I noticed that it probably also would have worked if I had just moved the vertical slide bar all the way to the right.
When I did it the way you described I noticed a thicker bar at the right (after switching to back from classic view). I pulled it to the left and there was the preview again. Sliding it back to the right made it smaller ... and then when moved far enough to the right it disappeared. Looks the same way it did when I finished trying out your method.
Thanks again. I did move the preview slider during my own research at some point. But it never occurred to me to just slide it further (all the way to the right) to make it disappear. Come to think of it, it is kind of Mac like (my opinion)