- Select points
- Select one or more pairs of points.
- Activate Stretch_Point
- Construct->Additional->Stretch_Point
- Invert Handles
- Invert each handle.
- Invert all handles.
Click "Invert Handle"
- Move Handles
- Move each handle.
- Move all handles.
- Symmetry
- The end of linear handle also moves simultaneously.
Check "Symmetry"
- Accept & NewOperation
- Click RMB.