iGPU - how do i configuer it right?

Long story short, ive used High sierra with my 1080 gpu, and ive upgraded to a 3060ti

Since it isnt even supported i have to switch to my igpu. But i have 0 clue where start with this https://dortania.github.io/OpenCore-Post-Install/gpu-patching/intel-patching/

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for example : How do i know what framebuffer to use?

and how do i disable my 3060ti ?

my setup is 9700k and z370-f