For keynote tags that are associated with elements, the end of the leader is free to be relocated to another location and not connected to just the boundary of an element. Therefore, when placing a keynote, you can select the leader option Free End or Attached End.
Material tags are assigned Free End and cannot be assigned Attached End. A material keynote tag's leader end identifies the material as you move it over different materials. The keynote value automatically displays the appropriate keynote value, if one is assigned.