Any modifications to leader annotation that change its position affect the position of the endpoint of the associated leader. Also, rotating the annotation causes the leader hook line (if any) to rotate.
To resize a leader, you can scale it. Scaling updates only the scale of the selected object. For example, if you scale the leader, the annotation stays in the same position relative to the leader endpoint but isn't scaled.
In addition to scaling, you can also move, mirror, and rotate a leader. Use the ScaleEntity, Move, Mirror, and Rotate methods to edit the leader. You can also change the text style associated with the annotation by using the StyleName property.