View.DisplayPageBoundaries Property (Word)
True to display the top and bottom margins (white space) and the gray area (gray space) between pages in a document. Read/write Boolean.
False to hide from view the white and gray space so that the pages flow together as one long page. The default value is True.
This feature is only available in the Print Layout view and only affects the gray space on the top and bottom of a page, not the left and right sides of a page. This setting affects the document in the in the specified window. When the document is saved, the state of this setting is saved with it.