lines on my 3d model in the layout tab that I do not want to be there

[n65b218]

 I want to get rid of the lines in the center of my 3D model. They keep showing up in the layout tab and I do not want them to. To clarify I am talking about the wavy lines you can see on the model and in the layout tab. I have tried to change it to only visual lines and they are still there. I have also tried to modify the visual style and nothing I can find helps get rid of these lines. This model was made with the loft command between different cross sections if that helps. I have attached the AUTOCAD file if you want to take a look for yourself.

[VincentSheehan]

How about the visual style Realistic or Shaded? Or would you like to see the outer lines?

[Valentin_CAD]

@n65b218 , 

Try the following setting:

[n65b218]

This fixes the issue in the model space but does not fix it in the paper space. My main concern is the paper space. If you know how to fix that that would be amazing thank you.