Does Flamingo support option ApplyShutLining? I have a trial version and i can’t figure out if i’m doing something wrong.

Nope you’re not doing anything wrong, at the moment nXt doesn’t see the custom render meshes like shut lining but you can use the command ExtractRenderMesh and then hide the NURBS version of the model. There should be support for these custom render meshes in a future version of nXt but I’m not sure when this will happen.