When I place a pad, there is a thin line enclosing the graphical shape of the pad. For example, if I placed a circular SMT pad at 1mm diameter, a solid red circular pad would be created. A thin line of about 1.4mm diameter would also be created surrounding the pad. The same line would be created if a rectangular pad was created.
What does this line signify? Is it possible to change the dimensions of these lines?