Here are the settings I use on my wallets. You can use these as guides, but every laser will be different. You can also get faster or slower engraving depending on how you adjust the settings.
Mark Loop: 1
Speed: 1000 mm/s
Power: 100%
Frequency: 50
Hatch 1
Count: 1
Line Space .025
Angle: 45
All calc: off
Follow Edge Once: off
Cross Hatch: off
Hatch 2
Same except
Angle: -45
I like it better with the second hatch, but I've also not done it to speed things up