You can reduce or enlarge originals by any zoom ratio in 1% increments. Any ratio from 50% to 200% can be set. The same zoom ratio is used for the horizontal (X) and vertical (Y) axes.
Place your originals and specify the destination → press the Scan Settings drop-down list → press [Option] → [Copy Ratio].
Press [-] or [+] to set a zoom ratio → press [Done] → [OK].