Drafting: How to deactivate center line generation?

Thank you özgür kesebir.
I deselected "generate center lines"

And still they are there.
And another strange thing happened: Now I can not change the options anymore. The whole "Geometry Generation" section got deactivated.

  1. Step 1:

    Still having center lines.

  2. Step 2:

    Options ("Geometry Generation" section got deactivated)