Inverting the orientation of a curve

1	After starting the Invert Curve Orientation command, click on each of the curves whose orientation you want to invert. Remember you can always change the selected curves (for example if you selected one or more wrong ones by mistake) by clicking on Curves and selecting new curves (or by right-clicking on Curves, choosing Reset in the context menu and selecting new curves).
2	An arrow is displayed to show the current orientation of the curve. Move the cursor onto the arrow and double-click to invert the orientation. The change will be immediately displayed.
3	Click or to confirm your selections and actually invert the orientation. Click to discard your changes.