2.5 brought many great UI changes, but a few seem unfounded and, in my opinion, were steps backward. I’ve never been a fan of left-aligned interfaces. This plugin resets the interface to the center of the window. All proper credit to «Remove Max Width» by Dion Hulse — http://dd32.id.au — all I really did was regress and modify some CSS…
Этот плагин можно скачать и использовать при автономной установке WordPress.