After initial set up for the use in Editor, you must attach the ASPEditorGroundPositioner component next to the EditorFormationPlacement. This will essentially do the same as the real-time placement component ASPGroundPositioner, make sure that the A* Pathfinding NavMesh will be used when looking for unit's valid ground placements.
ASP Editor Ground Positioner for Editor Formation Placement
Great! Now you can utilise the A* Pathfinding with formations in the Editor.
