About Hierachical LOD Ouliner LODSystem settings


I just start using Hierachical LOD and something appears strange to me: in the Hierachical LOD Outliner, I added multiple Hierachical LODSetup under LODSystem, but it still generate only 1 mesh, without any LOD in it, despite of my settings.
I bypassed this problem by making LODs for the generated mesh but I don’t know if this is the best way to use the tool knowing it seems have options into LODSystem for. Are something wrong in my settings?