The Numeric Edit tool applies the settings of the Xtream Path 2 panel to the path segment on which you click. The anchor point nearest the point clicked is altered. The values you enter into the panel's fields determine the length and angle of the nearest anchor point's direction lines.
You can duplicate another anchor point's direction line using the Numeric Edit tool. Hold down the Shift and Option keys (Mac) or the Shift and Alt keys (Windows) and the Numeric Edit tool becomes an eyedropper. Click on the curve you want to duplicate near the anchor point. That loads the nearest direction line values into the panel. To apply those values to another path segment, simply click on it near the anchor point you want to change.
The Length field determines the length of the direction line. A length of zero deletes the direction line. The Direction field determines the angle of the direction line relative to the artboard, not the path segment. You can change the length or direction of a direction line individually. If either box is unchecked in the Xtream Path 2 panel, the direction line will maintain its original length or direction.
There are several ways to manually change values in the Xtream Path 2 panel for the Numeric Edit tool:
Double-click in either the Length or Direction field and type a number.
Use the up/down arrow buttons to the left of each field to change the existing value.
Click anywhere in the circle below the Direction field.
Drag the line in the circle below the Direction field.
Use the buttons to the right and below the circle to switch to the horizontal or vertical inverse of the current Direction value.
Example: