How to swap high-performance GPU and power saving GPU?

Question

Using Intel Arc A380 and NVIDIA Geforce RTX 3080 Ti.
After installing Intel GPU, GPU performance decreased dramatically.
This is because the Windows OS recognized the Intel GPU as a high-performance GPU, and the Intel GPU was doing everything even though all monitors were connected to the 3080 Ti.

There's no menu to select a high-performance GPU in Settings -> Graphics -> Change default graphics settings
I tried contacting Intel customer service, but they replied that I should contact Microsoft as this issue is controlled by Windows.

Answer 1

I don't know if the OP will see this but I had the same issue and figured out how to fix it so for anyone else here's how.

Go to Settings>Display>Graphics>Default graphics settings

At the very top where it gives you a drop down to select your Default high performance GPU select whatever one you want, as long as you change it from "Let windows decide" (For me I have a 6750xt and a 6600 so I selected the 6750xt).

From there go back to Settings>Display>Graphics and select an app then click options (just to see if it worked) and you should see (in my case).

Let windows decide
Power saving: RX 6600
High Performance: RX 6750xt

Specific GPU: (Dropdown)

If the GPU in High Performance and Power Saving are what you want then it worked.