Within the holes there is no opition for a square type of hole, lots of other types.
We get this request all the time, for users placing in HD bolts and making plates to form the bolt box base, they want to punch a square hole, so we have to tell them to use a contour to create it and array or polar array.
Be a lot easier to create a hole pattern an then set the parameters for the setting out, then just change the type from round to square.