In 2D Drafting, after creating dimensions it is possible to manipulate the leaders. When selecting the dimension that have been created, some white squares appear at the leader ends. These can be dragged by clicking the left mouse button and holding. When moving them, by dragging one, the square on the opposite side of the dimension will follow. By holding<Ctrl keyboard> it is possible to manipulate these squares independently from one another.
The following video details the process: