The WordPress SEO Plugin by Yoast is a wonderful plugin for all practical purposes. However its got a minor glitch (or feature – depends on how you perceive it) that it adds extra columns to all post listings. Removing them is easy, but not many people venture into that part of WordPress – The Screen Options. Unselect the columns corresponding to WordPress SEO in screen options so that you don’t have to see them in post listings again. Screenshot Below

Hide Wordperss SEO Columns