I have just started using Bikecad pro and I love it! I have the latest version. My problem is designing a double integrated seat tube and top tube, like on the Budnitz (see pic). I understand that I have to use a workaround and connect the seat tube to the head tube. That works OK but I then want to adjust the curvature and I can't work out how. I see in an older post that you can adjust a field called tire clearance to change the curvature, but I can't find that. Any help gratefully appreciated.