How the cutting path is built
If you need to cut a square, simply draw a black square of the required size. The program will build the path based on its shape.
If you need a square with a hole, draw a black square and place a white circle of the required diameter on top of it. Then the path will work like this: first the wire will move to the circle, cut the hole, and then continue cutting the main shape.
If you do not like how the approach to the hole is built, draw a thin white line from the edge of the part to the circle. Then the path to the hole will follow that line exactly.