How to split an SVG file into multiple segments to fit the print bed

Many of the art editing tools will use a “mask” to present only what you define and this can be very confusing as the unwanted items are still there as you said. I might suggest you bring the entire map into LightBurn and use the ‘Boolean’ tools provided in LB to split your work into appropriate sizes for the laser bed.

Here is a video demo of how the Boolean tools can be leveraged t achieve various looks.

We also recently added the new Print & Cut feature that you might want to look into as well for “Larger than the bed” cutting.