Hovering over Direction 
on the Create Composite Curve toolbar displays the Direction toolbar. Use the toolbar to determine the default direction at a branch point.
Click Straight to give:
Click Left 
to give:
Click Right 
to give:
Click Stop at discontinuity 
to give:
This is the same as Straight provided the angle at the branch point is less than the discontinuity angle specified on the Composite curve creator page of the Options dialog. However, it stops if the angle at the branch point is greater than the discontinuity angle specified.
Click the pink curve to give:
In this case, the composite curve extends as far as point 
. Because the angle at the branch point is greater than the discontinuity angle, the composite curve creator extends the curve from the other end (point 
).