LightBurn ignores line width when importing, and just follows the line (Line mode) or fills closed shapes (Fill mode, aka engraving).
There are two approaches that work here:
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Convert the “fat lines” to enclosed paths, which is what Rick suggested above by converting strokes to paths. Most design software has an option for this.
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Export the file as a high-resolution PNG image file (to preserve transparency) and engrave that. This means that everything you see in the original is exactly what will appear in LightBurn, including fills, gradients, patterns, etc.
The RetinaEngrave software most likely uses a print driver, so the source program (Corel) is rendering the data as an image that’s then just being brought in to the laser program to run. We’ll have something like this too at some point, but it’s non trivial to do.