Unable to use NVIDIA GPU ONLY in the Display Mode

[DavidLi4405]

I have a new laptop and I've connected it to an external monitor with a display cable ( one end being a mini display port and the other end being a normal one). When trying to play games, the game is blurry and screen tears because of the display mode being stuck at optimus. The reason that I'm given is that I'm using an external monitor, which is why I'm stuck on optimus. Is there any way to resolve this issue?

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