The Delete Multi-line function is used to remove an entire signal track.
To delete a track, you must first position the cursor somewhere within the interior of one of the segments of the desired track and then press <left mouse> or <Enter>.
The target line segment is first deleted, then, recursively, each line segment, free pad, or via coincident with the deleted line segment's end-points. The process will terminate if a component pad encountered.
The affected track can be "undeleted" immediately simply by pressing <right mouse> or <Escape>.
Lines contained within components are accessible only from the proper layer.