I use 'Fit to Drawing' in Visio a lot.
The resized page width fit my drawing objects neatly though putting some extra page margin spaces that I don't want to have.
How can I remove them?
Similar question asked here
https://superuser.com/a/805495/34893
In brief
Developer
tabShow ShapeSheet
for Page
Print Properties
Set 0 values for PageXXXMargin
where XXX to be Left, Right, Top, Bottom