Yes, the repetition you have made there is only visual. But why would you want to calculate the repeated system? It just takes longer time. The calculation should always be carried out for the minimal cell, not only to save time, but also to make it easier to interpret the results.
If you want to really repeat the system in order to introduce a defect, you can do that in the Builder - send it from the Custom Builder to the Builder, and apply a repetition in Z.