- Click Tools | Project Settings
- On the Tolerance Settings tab, check the box next to Show Snap Tolerance Circles.
- Click OK.
You will see the snap tolerance circles around the ends of the polyline. The ends of the adjacent polylines must both be inside both snap tolerance circles (area highlighted in yellow below) for the polylines to snap together.
If you do not see the snap tolerance circles, or they are too small, you need to increase the Snap Tolerance value. To do so:
- Click Tools | Project Settings.
- On the Tolerance Settings tab, increase the Snap Tolerance value.
- Once the ends are all within the snap tolerance circles of the adjacent polylines, then click Draw | Edit Boundaries | Snap All Polyline Segments to snap them together.
If they are snapped, try moving the polygon marker to a slightly different location. In some cases, moving the polygon marker to a slightly different location within the set of polylines allows the polygon to be created.
Updated December 14, 2018