For me at least Apple TV set to 4KSDR, HDMI Output to ycbcr then the chroma option will be under that as seen in this screenshot.That all sounds interesting but are you talking about changing options on your tv or on the Apple TV? Can you give some directions where to look for those changes? I'm just running HD, not 4K and mostly I'm streaming movies from my computer. I don't know how changing the chroma setting on the TV would affect the bluetooth remote to Apple TV. Or even changing Chroma on the Apple TV (if that's what you're talking about) because There really shouldn't be any relationship between the chroma setting and bluetooth.
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