I have the same question and was hoping the answer would be in this thread. But I see James never responded when you asked him what width he wanted his sidebar to be set at.
I don’t know if I can tell you in pixels, but on the site I’m developing with Ambition Pro, it appears the main column is about twice the width of the sidebar column. That means the sidebar column is set to about 50 percent of the pixel width as the main column.
I would like to be able to see how the page looks with the sidebar column more like 40 percent of the main column, and also 35 percent. I believe one of those two options would get the width of the sidebar down to where I want it.
Thanks for your assistance.
Jeff Brody