I'm not sure why but quite recently Finder likes to show me the Preview panel on new Finder windows. 

I've tried every method I could find:

* Hiding the preview. Close the finder and open a new window. Will show the same preview again.
* Go to `/Users/$username$/Library/Preferences/com.apple.finder.plist` and edit the `ShowPreviewPane` setting it to `NO`. This will magically revert to `YES` after I relaunch the Finder.

I'm out of ideas. What could I do?