The ‘Spatial Elements’ option on the Splash Screen should be chosen when a Detailed Revit Model includes rooms and spaces. This will use the Rooms or Spaces as well as model geometry in the model to generate results . Surfaces will be generated on the exterior of the Revit Model based on level changes, internal walls and on the Rooms and Spaces placed in the project.
Note: Spatial Elements is supported for Revit 2019 and 2020 only and is no longer available for Revit 2021 or Revit 2022.