The page size of the assignable unit is inherited from the title properties by default. Changes applied to the page size within your assignable unit's properties will only be applied to the pages contained within the assignable unit. Consideration should be made for your intended users, and the width of the page size should match the most common resolution of users' monitors.
See also: Understanding inheritance
To change the page size of your assignable unit:
In the Title Explorer, double-click the 
graphic of the assignable unit. Alternatively, you can select the graphic, right-click, and select Properties. The Properties ribbon is displayed.
In the Page Size group, disable the Inherit Page Size check box and use the Width and Height fields to specify the new dimensions of the page in pixels.
The page size is changed.
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