Manual Focus for laser

First time setting up and using the laser. My camera will not autofocus no matter what I do, I have to do manual focus. It asks me to pick which engraved line has the best engraving result. Problem is I have no idea which line has the best engraving result. They all look pretty good. Some are thinner, some are fatter. Which is the best? The first time I did this I picked the one between the thinnest and the thickest. Then I proceeded to the sample project. Problem is the laser did not fully cut through the wood with the sample project. Anyone have any tips? Thanks.

Maybe this will help:

Thanks Brent. I’ll give it a try.

They really should just reword the choice to “pick the thinnest line” then. Like anyone brand new to this has any idea how to qualify what is “best”