Cutting thicker lines with blue cut setting

"blue cut setting but need the lines to be a bit thicker"

The control of the line-weight is directly tied to speed and power. For a heavier line, Engrave Slower, or Increase Power.
If you want to make a second line next to the first line that could emulate what you’re looking for.
The colors are just flags so you can tell layers apart. There is no laser behavior that is inherent or attributable to the ‘Blue’ Layer that can’t be set identically in any other layer.