Hi MCO, how's it going.
This is, I would guess, about you layout size. The default layout width is quite modest to accomodate different screen sizes/windows/etc.
You can drag it to widen it or adjust it on the layout properties palette. I use about 900 to 950 so that it looks okay on a 1024 monitor with room for the browser window to be a bit smaller.
Hope that helps.