Split from this thread.

You can customize the middle column. See "Arrange By"? Select Custom Arrangement to create your own sort options.

You can hide the folders (blue section) to gain more screen space. Under View in the Menu bar uncheck "Navigation Pane" (You'll also see hide the Ribbon too) . It doesn't have a shortcut assigned but you can add a shortcut in System Preferences > Keyboard > Keyboard Shortcuts.

some body know how to resolve it ???

i'm also got that same error when we want to use right reading pane columns it will disappear 

i know about John but i think dianeoforegon that it not way to resolve it.

thank you so much