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Glowforge divides uploaded designs into steps according to the colors of their paths.
So if you want a design to cut in all one big step, you should change all of the path colors to be the same before uploading to Glowforge.
You can take advantage of this by ordering the colors ahead of time. Glowforge will start with whatever color has the lowest hex value, and go from step to step in order, according to each color’s value. This could be really useful when you are cutting items from the inside of other items, you generally want to cut from the inside out.
For more information on using custom palettes to make this easier: