To modify the orientation of a linear, arc, or line string form

Select the Modify Form Orientation tool.
Identify a linear, arc, or line string form. A red arrowhead appears, pointing along the axis of the form’s placement and in the direction of the orientation, and appears next to the form’s active side, which is the side aligned with the placement point.
To reverse the direction of the form’s placement, turn on Direction in the Modify Form Orientation tool settings window.
Accept the selection with a data point. The red arrowhead changes and points in the opposite direction.