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Level 10

In teh hierarchy view - click on the Master Page/ Page1. Now on the object palette on the Master Page Tab you can choose a Paper Type. If you scroll to the bottom of the list you can choose a Custom size. The width and height dimensions are now available to you. The UI in designer limits you to 59 in. If you need more than that there is a way to get bigger but you have to do it in the native XML format. Let me know if you need more than that. Here is a modified sample.

Paul