After watching a tutorial on architectural drawings in trace, I followed the instructions on creating walls, then in a new layer, trying to apply smart fill. Not sure why, no matter where I set the slider on tolerance, the whole screen fills. Seems to not recognize the wall lines on the New layer? I was told that if the new layer is yellow, as in selected, the smart fill wont recognize the wall lines in another. Layer? If this is true how do I accomplish filling in walls on a separate layer?