Posted by ravas on Nov 08, 2015; 9:12am
URL: https://forum.librecad.org/Adjusting-the-printer-to-print-dark-lines-in-LibreCad-drawings-tp5712550p5712559.html

"...then when I click on one of the lines..."
It sounds like you are still using Modify → properties.
You want Modify → attributes.

The link is a proposal; there is nothing to download.