no sidebar Fullwidth

Congrats for your nice and well balanced Themes. I have one important issue. How is it possible to have a no sidebar, fullwidth Page using Kathmandu ? Although I have already seen brief References concerning the fact(f.e.upgrade to Pro) in previous posts,it is important for me right now with free version, to eliminate in full screen mode the disturbing big white margins left and right in main body of page somehow, as I'm trying to develop in last stage the personal site of a relative of mine. When using sidebar there is of course no Problem. Thanks in advance