Windows 10 getting HEVC H.265 Codec to use Hardware Acceleration
From what I found, the Quick for Desktop (Windows10) does support the import and playback of HEVC files, but it lacks Hardware acceleration for those HEVC files when you have a Desktop PC with a dedicated graphics card where you cannot switch between integrated and dedicated graphics as you can on a laptop, as often suggested as a solution.
Consequently, I think that for hardware acceleration you need to wait for an update to GoPro Quik. This capability is simply missing in the software and there is no setting to be turned on.