It varies by system.
Plex uses the default GPU, so you need to set the 1060 as the default. On some systems this can be done w/o disabling the i7 GPU. You’ll have to check the BIOS settings for your system.
Edit: Example from my Gigabyte motherboard.
If I set Initial Display Output to PCIe 1, Plex uses my video card for hardware acceleration, even if Intel Processor Graphics is still enabled.
If I set Initial Display Output to IGFX, Plex uses the graphics processor in my CPU and ignores the video card.
