How to export from Blender collision with LODs in one single FBX file?

How to export from Blender collision with LODs in one single FBX file?
I found this video shows how to export LODs:How to export LODs from Blender to UE4 in one single FBX file! - YouTube how to show collision in view window? I know the “pxvis collision 1” command but it slows down performance dramatically.