Rick
(Technical Evangelist)
3
Welcome. You are in the right place, so everything is good. 
Looking at the first SVG file you shared, I see the design has many duplicate shapes sitting atop each other.
I deleted all duplicates, then added back a duplicate of the outermost rectangle to produce this (see below) as filled:
I share the following to assist in understanding how LightBurn uses shape boundaries to toggle filling. Important for understanding and worth a read.
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