Use the Segment Edit tool to reshape a path segment while maintaining smooth anchor points. As you drag, the selected path segment is reshaped, as well as neighboring path segments connected by smooth anchor points. Adjacent path segments connected by a corner point are not altered when using the Segment Edit tool.
TIP: To edit a smooth path segment without altering neighboring segments, use the Segment Direct Edit tool rather than the Segment Edit tool.
In the Xtream Path 2 panel, you have the option of showing or hiding the direction lines for the path's anchor points. You can hide all direction lines, show only those for the path segment being edited, or show direction lines for all of the path's anchor points. You can also elect to show the path segments direction lines while dragging a path segment. When visible, direction lines can be dragged with the Segment Edit tool.
TIP: Pressing the Option key (Mac) or Alt key (Windows) converts the Segment Edit tool to Illustrator's Add Anchor point tool (if over a path segment) or Delete Anchor Point tool (if over an anchor point).
Example: