Most of the dashboards have a native Landscape orientation, sized to 8.5x11. We use code in our css to "force" the browser to print that way, but not all browsers listen to us. The css hasn't been accepted as the current standard yet, so it's really more of a suggestion at this point. So if you print and the orientation is wrong, just manually change it. If the print preview still looks weird after you change the orientation, change the margin settings to 'Default'.