This option is used to remove an unfinished PCB Tracks or unfinished Schematic Connections within your designs.
Unfinished tracks are tracks which do not have both ends finishing on a pad, via, mounting hole, testpoint, copper, template, track, or any other electrical item.
Unfinished schematic connections are connections that do not have both ends finishing on a pin, block terminal, bus terminal or another connection. They are not unfinished if they end on a junction with a visible net name attribute, unless they are connected to a bus at the other end.
Tracks deleted using this option will be removed back to the nearest node that they connect to.
Shortcuts
Toolbar: 
Default Keys: None
Default Menu: Utilities
Command: Delete Unfinished Tracks