Hello folks,
there is no problem at all to ask questions of any kind here.
But IsoDraw is a very extensive sofware with many possibilities. Therefore, all new employees get a three-day training from external service providers to learn the basics of IsoDraw.
One problem with the "mask" command is that all elements in the ellipse still exist. When there are many masked ellipses existing IsoDraw become very slow in a graphic. That's why I cut off often protruding elements.