How to change the size of page in Acrobat XI pro

I would like to save a PDF docuemnt with another size of page.

I can't figure out how to do it.

For Acrobat X and earlier the advise was to go to Crop tool (or by Ctrl-Shift-T) and chose from drop down menu.

This advice seems to eb not valid anymore with Acrobat XI, as Cropt tool doesn't have any drop down menu, but Ctrl-Chift-T leads to Insert Page dialogue.

I'd appreciate an explanation whether it is possible in Acrobat XI Pro and how.

Thanks!

-Sergey-