Changing default display on moderation queue

I’ve just updated my blog to the latest version of WordPress, and am having some issues with the moderation queue. In the older version, all comments held in moderation would be displayed on one page, and I could mark them all as spam at once. With the new version, the queue defaults to only displaying 25 at a time, so I have to go through pages and pages, making what was a quick, simple process into a time-consuming and tedious one.

Does anyone know how to change the default display to show all comments in the queue at once?