User blog comment:Kirkburn/Technical Update: August 5, 2015/@comment-25648422-20150811155635

There seems to be on of the techincal updates I observe: when I edit in "Classical editor" > "Source mode", the edit - format layout (or whatever people call that) has already extended to the right side, but I can still click the arrow that makes the section with the "Edit summary section" and "add features and media" spread back out.