Hi guys,
i know that version is basically for only review purposes, so i'm posting this here as a sort of a reminder when 2018.3 with nested prefabs comes out.
When editing an FSM of the prefab in the new prefab workflow window, any state that is being clicked and dragged goes all the way in the lower right angle of the graph view. Like, maximum graph size lower right. You can see how miniscule actually the window is on the minimap
I'll try it out in 2018.3 when it comes out. Note that it does not happen when editing prefabs in the scene view.