creo8 Drawing Setup option documentation for: DIM_LEADER_LENGTH 
(hidden) ( (Only MBD)
dim_leader_length
Sets the length of the dimension leader lines when the leader arrows are outside the witness lines.
Default and Available Settings:
0.500000*
1. The length of the dimension leader line of the leader arrow that is outside the
witness lines. The length is equal to the value specified by the dim_leader length Detail option.
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| The drawing_units Detail option determines the unit of
measurement for the dim_leader_length Detail option.
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