You don’t understand my bug report, or we talk at cross. The point is that in the StaticMesh Editor, the top main menu bar option switches automatically, as you said. I have 3 LODs for example. And I see them switch. In 4.17 Preview, there is this new option under LOD sections, which you can set to “Auto”, too. And I expect it to behave the same as in the main menu bar. Thus, when in StaticMesh Editor, the material sections should switch too, e.g. “Auto (LOD1)” but it doesn’t. Always stays LOD0 despite being in LOD1 in the StaticMeshEditor viewport. Do you understand what I mean? This is for 4.17 preview new functionality.