XS_MARK_LEADER_LINE_ARROW_LENGTH
Category in Advanced options dialog: Marking - general
Use this advanced option to define the length of
arrow head in mark leader line. The default is 2.5.
This advanced option is role specific. When the type SYSTEM(ROLE) is in use, the default value is used. When the type MODEL(ROLE) or DRAWING(ROLE) is in use, you can change the value, which is then the same for all users in the current model.