How do you draw an ellipse that has thick and thin lines?
I currently use Affinity Designer and I can achieve this simply by varying the pressure on the live using a Pressure tool.
Its unlikely to be one instance as I would be doing a technical illustrations with many ellipses. I've yet to check out Corel Draw as suitable software for doing technical illustrations.
you can move corresponding nodes.
Another way - draw two ellipses, one inside other, select both and "back minus front"