I am trying to convert old DWG files into PDF. When I convert them to PDF, I find that several features are now filled in with color (mostly shades of gray and black), and this ends up obscuring most of the image. In the parameters I tried setting the default fill opacity to 0, but it did not change anything.

How can I get rid of the fill color? These colors do not show up when I view it in Data Inspector. It only displays that way on the PDF version. Basically, I want the PDF to resemble exactly what the file looks like in Data Inspector.