How to Set Page Size
On the top Collage menu, click Page Setup button to set the paper size.
Preset Page Size: There are some preset page sizes for your collage including scrapbook, greeting card page size.etc, to choose.
Customize:You can select Customize option to set your collage size, with three types provided: pixel, mm and inch, choose one type and input the width and the height values. Furthermore, you might as well set the DPI of collage.
Orientation:Choose Portrait (vertical) or Landscape (horizontal) as the orientation to change the preview of your collage.