Pasteboard XT allows you to change the width and height of the pasteboard. This is similar to changing the pasteboard width percentage using the QuarkXPress application Preferences. Select "Pasteboard XT..." from the Utilities menu and enter a percentage of a document page's width and height to adjust the pasteboard. Note that the resulting height will be applied to all sides of the document page and will in fact widen a smaller pasteboard if the height is greater than the width. Of course, the pasteboard plus the spread dimensions are always limited to a maximum of 48".
Pasteboard XT will then automatically adjust the spread and page guidelines according to the new dimensions so that they remain relative to the page.
The "Default" checkbox can be used to set values to be applied to subsequent new documents. If selected, clicking OK will set the default values and will not alter the current document's settings.
WARNING: If you make a change to a document's pasteboard and run QuarkXPress without Pasteboard XT (by removing it from the Quark folder upon startup), the guidelines may not appear in their correct positions when you reopen the document (because the dimensions will revert to Quark's defaults). Also, if you are sending your document to someone else, you should also send them a copy of Pasteboard XT to avoid the possible shift in spread guides (and boxes off the page).
Installation: Simply copy the Pasteboard XT v1.5 icon to your Quark XTensions folder.