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creo8 Drawing Setup option documentation for: DEFAULT_LEADER_ARROW_STYLE            

(Also MBD)

default_leader_arrow_style

Sets the default arrow style for new leaders attached to geometry.
Default and Available Settings:
automatic* - Sets the arrow style based on the reference type as follows:
Reference
Arrow Style
Surface and Quilt
filled dot
Entity/Edge, Silhouette Edge, Curve, Sketch, and Free Point
arrow head
Datum Point, Datum Axis, Datum Csys, and Cosmetic Sketch
no arrow
dot
filled dot
slash
integral
box
filled box
no arrow
arrow head
double arrow
half arrow
target
triangle
* 
Leader attachments to non-geometric objects are not affected by this option.