A handle on a drag path can be moved by dragging it.
Also, if you drag a handle while pressing the Shift Key, the handle moves exactly horizontally, vertically or at 45 degrees in either direction from the adjacent handle.
If you drag a handle with the Ctrl key and the Shift key pressed, the entire drag path will move.
When the mouse cursor is set over a drag path, the cursor changes to a crosshair. Clicking the mouse button adds a new handle under the cursor.
When you drag a handle so that it overlaps with another handle, you can delete the dragged handle. If there are other handles between these two handles, they are also deleted.
However, the handles at the ends cannot be deleted. To delete the entire drag path, use [Edit]-[Delete].