Aspect Ratio

This control determines the aspect ratio of the exported image:

Proportional - the aspect ratio of the exported image will be identical to the original aspect ratio (based on the original plotter page, not on the screen view) of the selected exported area.  To do this one of the dimensions (X or Y) is usually reduced.

Fit to Page -  the printed image will be exactly fitted to the selected output size. This can lead to the deformation of the image.