I didn’t ask what your system says. I ask what you want.
Basically you can’t use the iGPU and the nvidia card at the same time. You probably need to disable it in UEFI setting, or at least make the nvidia card the preferred one.
If that has already been done and you still see the iGPU in lspci, then you probably need to blacklist i915 yourself and uninstall xf86-video-intel (actually you better not install any xf86-video-*)
Do not use the garbage xorg conf generated by nvidia-xconfig. Probably shouldn’t have run it and should rm /etc/X11/xorg.conf now.
Btw I am assuming this is not a laptop. For a laptop this can be a whole new story.