Posters can be ordered uncropped, but the cropping works slightly differently from prints.

1. Select Posters
   
2. Select a photo.
   
3. Click on the poster, and a tool bar appears at the bottom.  See illustration below.
   
4. Click and hold on the slider and drag it left.  This displays the entire image and exposes white space on the top or sides of the poster when the image is not the same aspect ratio as the poster.