Printing Two Pages per Sheet
When the radio button of "Unite 2 pages as" is pressed, you can print two logical pages onto each physical sheet of paper.
You can adjust the width of each logical page on the paper by pressing the buttons beside the radio button. The displayed figure shows the horizontal width of the reduced or enlarged page. If this value becomes 0, the two pages are printed on the same position. (cf. Examples Using the Print Options )
In printing two pages per sheet, you should make sure that the paper size or vertical and horizontal orientations are correctly specified in [Setup ...], and these parameter match the paper in your printer. Otherwise, the printed result would not be proper.
If you employ dviprt to print, dviprt can guess the paper size and orientation, and guessed parameter values are used as default in some case.