I tried to answer my own question. But, I could NOT :(
I see that I can select a "Different Template"
- Determines the template for the visual representation of the nodes. Alternatives are the currently selected sample representation from the palette and a rectangular shape.
Neither of the two choices that appear are what I need.
How do I define one with My Dimensions and Use It?
I tried to edit the Rectangle and Can't. I see the alternative "selected sample representation from the palette" and I see that I can create a Custom Template. But, it is also clear that I CANNOT use my Custom Template. because it is NOT a predefined Sample Template.
Help me please