WordPress 3.2 – Toggle Full Page Option on Page

I recently upgraded to WP 3.2 but now find ‘Toggle Full Screen’ option on a page doesnt display the full screen as older versions did.

Instead with the new version the page contents are squeezed ito a small column on the centre of the screen.

This is very frustrating as I have a lot of content on each page and perfer to work with a full page display rather than a normal WP page.

I have tried it with Windows7 and Vista but the problem is exactely the same.

Any suggestions how to rectify the proble.