I want to fit the page size to the drawing in Microsoft Visio 2013.
When I do design → Page setup → size → fit to drawing, they are still some margins:
There doesn't seem to be any way to change the margin in the page setup either:

How can actually fit the page size to the drawing? My goal is to export the figure as a PDF with all the surrounding white spaces cropped out.
I use Microsoft Visio 2013 Professional on Windows 7 SP1 x64 Ultimate.




