Hi Crofty,
To edit the LOD distance, open the asset in the StaticMesh editor. Under the LOD Settings, disable AutoComputeLODDistance. You can then adjust the LOD ScreenSize to change the distance.
As for LOD’s and foliage, this is a known issue that our developers are currently looking into. It should however still work but at different distances than the StaticMesh version. Play around with the ScreenSize setting to see if you experience this the same way. As a workaround, you could create a copy of the StaticMesh asset with different setting to use for foliage.
Thanks, TJ