When you drag a grip on an object in order to change its dimension properties, AutoCAD MEP 2022 toolset often constrains the grip to a line, curve, or plane. Whenever the constrained position of a grip differs from the current cursor position, the software displays dotted lines or arcs to inform you of the constraint and its effect.
As an example, refer to the following illustration of lengthening a duct segment. The current cursor position cannot result in an angle change because the software always constrains the Lengthen grip to the current angle of the segment.
