Center shapes on the drawing page
On the Shape menu, click Center Drawing.
If the drawing page and printer paper are the same size and orientation, the drawing is centered on the printed page as well.
Center a drawing page on the printer paper
On the File menu, click Page Setup.Click the Page Size tab, and then click Size to fit drawing contents.Click the Print Setup tab, and then click Setup.Under Small drawings, click the Center horizontally check box, the Center vertically check box, or both, and then click OK twice. To preview the drawing as it will appear on the printed page, on the File menu, click Print Preview.
A small drawing centered horizontally, vertically, and both.