The Grab Arc origin function is used to pick up and move a single arc, circle, or ellipse.
To grab an arc, a circle, or an ellipse you must first position the cursor somewhere along the edge (circumference) of the desired arc/circle/ellipse and then press <left mouse> or <Enter>.
The cursor will jump to the precise center point of the target item.
In the event of overlapping targets, arcs on the current layer are given preference over those on other layers.
Arcs contained within components are accessible only from the proper layer.