Set to Delete History, Keep History, or Bake History.
Detaches the skin and move it to its original, undeformed shape. It will not delete the skin’s skin cluster nodes. This is the default option. Use this option to preserve smooth skin weights when you bind skin again. This is useful, for instance, if you decide to add an extra joint to a skeleton but want to retain the existing smooth skin weights after you detach the smooth skin and bind the skin again.
Detaches the skin and delete its skin cluster nodes, but will not move the skin to its original, undeformed shape. The skin will maintain its current shape after detachment. This is useful, for instance, if you won’t deform the skin’s shape anymore and want to lighten the processing demands of your scene. (You might use the skin, for example, as a stationary character in the background of the scene.)
