It is possible to draw the registration marks (three variants of this marker can be selected) IN the corners (or BY the corners) and additionally along each side in the specified quantity. If the marks are drawn along the shorter or longer side, then drawing the corner marks can be turned off.
If you choose drawing registration marks only along one side (e.g. the longer one), while turned off the drawing corner marks – there is no space for marks along the other side (e.g. shorter) left.
Pressing the right mouse button on Variant 1 or Variant 2 will let you choose the color of the drawn registration marks
The idea of registration mark no. 3 comes from the BOP Co..