Visual settings allow you to change the overlay of the model between clay and material.
Material brings to color information from the Revit materials applied to the model.
Clay is the absence of material information and shows only white walls. Clay is useful if you prefer to show initial designs to clients so that they can get a feel of the space without being bogged down by comments on material choices.
Outlines can be turned on to give the model a more defined shape. It also helps make the model look more “sketchy” to imitate the visual fidelity of a CAD model.