I am practicing with Weldment and have a profile for 80-20 1515 size.

1. I cannot get the profile to align on the inside of the sketch lines, like the tutorials show as a functionality of weldments.
2. I want to leave the ends open because we will use corner end caps to bolt the ends to. No matter my selection one end allows moved to the middle of the intersection (see the arrow head below). I have "allow protrusion" deselected. I haven't even began to address adding the legs.