The trick you’re looking for isn’t exactly a setting, it’s a focus thing.[1]
The concept is called “defocusing”, you basically intentionally set the wrong material height on your engrave. Bunch of threads here:
https://community.glowforge.com/search?q=defocus%20acrylic
Great examples here from @takitus:
Which I guess is technically a setting, but you get what I’m saying
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