The ornamental design for an apparatus for aiding the layout and/or editing of items of sheet material, substantially as shown and described.
FIG. 1 is a front perspective view from above and one side, in the fully closed position, showing an apparatus for aiding the layout and/or editing of items of sheet material according to my new design;
FIG. 2 is another front perspective view from above and one side thereof, in alternative, open position;
FIG. 3 is a rear perspective view from below and the other side thereof, in the closed position; and,
FIG. 4 is a front perspective view from above and one side thereof, in the fully erected condition.