chaozh

post switch was created to free you from the hell of switching post panel in your admin dashboard when you want to edit more than one post at a time.
This plugin adds a meta box in your post edit panel and will display all posts in the related category for choosing. Once selected, the post you are editing with will automaticaly changes to the chosen post.

Post Switch

Post Switch allows you to switch your editing post right in your admin post edit panel

Chad Hovell

Select extra layouts from the post editor Screen Options menu. 
There are now 24 variations to choose from!

Three Column Screen Layout

Three, four and five column screen layouts for the post editor.

Post Switch vs Three Column Screen Layout