It would be useful to see some screenshots (please note, not phone camera shots of a screen please) of your settings the shape you are trying to burn etc? Perhaps your line is set to “fill” rather than “Line”? What happens if your test shape is a square and not a line? Does the laser diode stay on during traversal moves?
I had my line set to ‘Line’, not ‘Fill’ and that Bi-Directional switch was off (to the best of my knowledge it was off but for sure I had ‘Line’ set so the Bi-Directional switch should not have mattered).