Using AMFILLET2D, you can round the edges of two arcs, circles, elliptical arcs, lines, polylines, rays, splines, or xlines with an arc of a specified radius.
After starting this command, you can open the Fillet Radius dialog box, where you can select the fillet radius from the list and enter the radius value. You can also set AMFILLET2D to assign dimensions to the rounded edge and to trim the intersecting lines at the corner edges.
You can change the color of the grip in the Selection tab in the Options dialog box.