Where is "Rebuild at Runtime"?

In UE 4.7 Under Edit -> Project Settings -> Navigation Mesh was the option “Rebuild at Runtime” which update the navmesh on runtime but on UE4.8 I can not see it. As you can see on this video: it is under “Runtime” but my options are different:

Set Runtime Generation to ‘Dynamic’ it’s the same as ‘Rebuild at Runtime’. It was changed because we added third method, so it’s no longer binary option.