Unity breaking FBX

I hope this is the right area for my question. When I import a model car (they are high res models) Unity will break up the FBX into pieces. How can I prevent this? A friend imported it and made a prefab and it didn’t break it up on him but with all his help I could not resolve it on my end. Using Unity’s latest version. Thanks for any help.

having auto or 32bit index format in import settings should fix that (but that should be enabled by default)
5286189--530181--upload_2019-12-16_8-42-5.png

I looked everywhere on Youtube, blah blah. Friend helped me. I had it set to 16. Thanks a lot. That worked.