Wall Thickness on Floorplan

Super disappointed with the floorplan feature because you cannot adjust your wall thickness. Not being able to adjust my wall thickness effects the entirety of each floorplan. For example if the inside of a wall measures at 5’10” and the outside of the wall measures at 6’3” - the system automatically puts the outside of the wall at 6’2.5” … which is wrong. The walls for this home measure at 5” but DF does not let me adjust wall thickness/depth. I cant believe this feature does not exist as it is CRUCIAL in order to make a credible and to scale floorplan. Please fix this.