When drawing a Polyline Arc then applying a line width displays the arc correctly. However when I select a line type like Centre or Fenceline, the arc fills as a closed shape (between the vertices). When using Centre as line type and a line width of zero the arc display correctly. Any other line width value fills the shape.

Exporting to PDF displays the arc correctly even if on the screen the arc appears as a filled shape

Can someone propose a solution.

Thank you

(Draftsight V1R3.1 - Mac)