I am a regular user of Draftsight (Mac) and stumble into one issue sometimes: in every drawing I make, lines are on z=0 and circles are by default on z=1. I cannot find a way to solve this. If I look in 3D, circles are nog elevated, but sometimes trimming lines and circles, does not work because they are not in the same plane. How do I get circles to be on z=0. Or how can I flatten the drawing?