Over fifteen years performing general home inspection one main electrical distribution panel(s) / cabinet(s) is how the panel is positioned in the wall cavity.
MASONRY: Expected cabinet(s) and panel board(s) shall be installed so that the front edge of the cabinet will not set back of the finish surface more than 1/4 inch.
WOOD / COMBUSTIBLES: Walls constructed of wood or other combustible material, cabinets shall be flush with the finished surface or shall project there-from.