In a sketch, applying a dimension, while dragging thedimension, there is a small symbol of a mouse with a padlock on itwith the right click button hilighted. If I right click, the littlepadlock toggles locked/unlocked. But i can't figure out what thisis doing? Not finding it in help either. I'm guessing it might besomething useful, but what?

Can someone tell me what this does?SolidworksSketching