User blog comment:Rupert Giles/Layout Changes: Breakpoints and Typography/@comment-5739199-20150519190809/@comment-126761-20150519191516

The 'normal' layout in your screenshot isn't correct - the preview buttons should be on one line. I'm not able to reproduce this though - can you send in a report to Special:Contact/bug with more details?

I will pass on your feedback about the editor width.