Master.ResizeToFitContents Method (Visio)
Resizes the page, or the master's page, to fit tightly around the shapes or master that are on it.
expression A variable that represents a Master object.
After the page is resized, the page height and width and the PinX and PinY values of the shapes or master are typically changed.
Calling the ResizeToFitContents method is the equivalent of selecting Let Visio expand the page as needed on the Page Size tab in the Page Setup dialog box (on the Design tab, click Size, and then click More Page Sizes).