Visible handles may be edited directly with the InkScribe tool:
Doubleclicking
a handle changes the anchor point associated with the handle from corner type to smooth type and vice versa. The handle may move when the point is changed to smooth. Shift-doubleclicking
a handle removes it.
Dragging
a handle will move it in the same manner as the Direct Selection tool (unless connector point recognition is enabled and the point is a connector point; see Connector Points). While dragging, pressing Shift
constrains the angle of the handle to 45° increments around the general constrain angle; pressing Option/Alt
constrains the angle of the handle to its original angle; and pressing Space
moves the associated anchor point. If the handle is one of a pair, pressing the T
key toggles a mode where the handles are kept exactly 90° apart.