The Remove Leader command is used to remove a leader from a label or group of labels.
To remove a leader, go to
Ribbon: DM Electrical->One-Line Diagram-> 
Remove Leader
Pulldown Menu: DM Electrical->One-Line Diagram->Remove Leader
You will be prompted to select the label from which the leader is to be removed.
Select label to remove a leader from:
After you select the label, the leader will be removed.