Use the Boundary Condition Settings tab of the Structural Settings dialog to specify family symbols and adjust the spacing four each boundary condition representation.
 Settings panel
 Settings panel
 (Structural Settings).
 (Structural Settings). 
  Four symbol families are pre-loaded in structural templates. These families can be duplicated and edited to meet your display standards or needs. If the families are not loaded, you must first Load a Family in order to specify it in this dropdown list.