Use command Edit/AdjustNode [OrbWin] or Adjust [OrbWeaver] to click and drag node locations to tidy up the boundary. (Note: This is not technically necessary, but it results in prettier graphics.) In the image below, command View/SetColors [OrbWin] or Kolor [OrbWeaver] has also been used to turn off the small green triangles that (by default) mark the center of each finite element. (Their purpose is to help you to distinguish between a triangular element and a triangular hole in the grid.)
