Roll20 Wiki says: If you want to manually reveal or hide areas, you can use the same Fog of War subtools from the Tabletop Toolbox . The Reveal Areas , Polygon Reveal , Hide Areas , and Reset Fog tools are all available to you for Advanced Fog of War. If you choose to reset the fog or manually hide areas, the areas within the Token's set sight or vision range can not be hidden from view. If you want to keep an area hidden even from the Token's range of sight, you'll want to use both versions of Fog of War at the same time.