The Harmonic Index Range setting within the Cyclic Controls category is only used in a Modal analysis that involves cyclic symmetry to specify the solution ranges for the harmonic index. The setting appears if you have defined a Cyclic Region for this analysis.
The Program Controlled option solves all applicable harmonic indices.
The Manual option exposes additional fields that allow you to specify a range of harmonic indices for solution from the Minimum value to the Maximum value in steps of the Interval value.
Note: Static Structural cyclic symmetry solutions always use all harmonic indices required for the applied loads.