I see that you have tagged Grbl and ruida in your post. These are mutually exclusive.
None of the Ruida controllers communicate with GRBL and none of the GRBL controllers communicate with Ruida.
Please tell us what kind of laser engraver you are having problems with in this case.
I would also like to know which version of LightBurn you’re using and more about the computer and how you have connected to the engraver.
Putting the information in your Profile saves time and reduces back-and-forth questioning.