Video describes what AutoCAD does to inform users of the current fillet radius. The fillet radius is save in each drawing and can be preset in the drawing template. Architect’s working on very small scales (1/8″=1′-0″) or (1:100) prefer to set the radius to 0 in the template as opposed to 1/2″ or 1″ since it is difficult to see small radii and if one overlooks the radius prompt, many small arcs can be unnecessarily added to building plans. The result would be blown dimensions.
Source: Autodesk