By default, the Line Weights view is off. It displays lines with the weights defined in the PDF. When Line Weights is on, it applies a constant stroke width (1 pixel) to lines. When you print the document, the stroke prints at the true width.

 

View a document with the Line Weights view on

  1. Open a PDF file and the Line Weights view is off by default.

  2. Choose View > Ruler & Grid > Line Weights to turn it on.

  3. To turn off the Line Weights view, choose View > Ruler & Grid > Line Weights



Line Weights off (Left); Line Weights on turning lines into a constant stroke width 1 pixel (Right)