How to force game use dgpu instead of igpu?

Hello, I have Asus Strix Rog G15 Advantage Edition laptop (6800M/5900HX). I think game is using iGPU instead of 6800M. I am using external monitor with DP Alt Mode.
Is there way to set display adapter? There is no setting ingame.

Thanks.

Try this?

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Thank you Google man

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