To change the page size

1. In Layout or Data view, open the Report menu, and choose Report Properties.
2. On the Appearance page, set the Page width and Page height properties to the dimensions you want. (The unit of measure is based on your locale, but you can change it by typing in a different unit designator such as cm or pt after the number.)

Or

1. In Layout view, select the report in the Properties grid.
2. Expand the PageSize property, and set the Width and Height in the grid.

Note: The page size is not reflected in the Report Preview. Select Print Preview to see a rendering with the actual page size.