The option is used to define additional code parameters determining values of displacements (limit displacements). It is available after pressing the Service button located in the Member Definition - Parameters dialog box.
The user may define limit displacements (member deflection in the directions y and z, nodal displacements in the directions x and y) and additionally, whether a member is a cantilever, while calculating member limit deflections.
In the lower part of the dialog box the are options for definition of parameters of members with camber: