Hi PaQ - that's a bug - the case of an only 3 or 4 sided network with no interior sections is handled by a special case and doesn't currently get the new options applied to it at all.

I'll update that for the next release. Currently if you stick in a middle curve in there in either direction then the new options should work.

Use Construct > Curve > Iso to quickly plop in a curve in the middle of that surface you got there, then redo the network including the middle curve.

- Michael