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A simple straight line can only have 2 magnet points at head and tail.

A multi-segment line, however, has a magnet at each segment boundary.

One approach might be:
  • View > Magnets
  • Hold down the shift key to constrain line drawing angles to multiples of 45 degrees
  • Make first click to start a straight line near the top of the canvas
  • Move down the canvas (keeping the shift key down) clicking once for every additional straight line segment
  • Dbl click to complete the line

You should now have a vertical line with magnets at various points.