How to make and cut a straight line with Lightburn

I am just starting to use Lightburn software and it is not as friendly as it seems when I watch the hours for videos.

I am trying to cut the corner off of a piece of wood.
I just the pencil to draw a straight line then use the same settings as I did with a rectangle key chain.
But, the laser just lightly scores the wood and will not slow and cut.
What am I doing wrong?
thanks,