Do you remember what it was that you did?
I can see that the problem on mine is it is forcing use of LOD 0 (which was autogenerated when converting from static mesh to skeletal using the in-engine tool).
I have combed through every LOD property in the Asset Details looking for a way to disable using LOD at all but cannot find anything. If I set “Number of LODs” to 0 it autoreverts back to 1 