A

Select the polygon by right clicking near one of the "points". Points are shown as small boxes.

B

A select box will appear around the polygon. The select box has eight small boxes, one at each corner, and one in the middle of each line.

C

Zoom in by hitting the "z" key or left clicking "in" from the main menu bar. Zoom in until the polygon nearly fills the stitch window.

D

You will see a small box in the middle of the right hand vertical side of the select box. Left drag this line toward the middle of the polygon.

Next Step

Convert the thin polygon into a line.