Specifically. I don't own the unit but I just looked at the manual online and there is NOTHING about it.

And other shops that sell the monitor also have a completely different product description.

Examples:
https://www.techmania.ch/de...
https://www.pc-ostschweiz.ch/product-2a...

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Digitec obviously gets the product from Caseking... because there is the same description:
https://www.caseking.de/lg-ultrage...

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TL;DR: I think the product just doesn't have RGB lighting.