Sony FX 6 Quick Start Manual page 133

Cine EI: Loading Custom LUTs
In this particular case, I chose the first free space with No LUT. The custom LUT will
now appear in this list when you select a LUT on status page 1. It will appear in the
VF in Cine EI mode once you have the LUT turned ON for the VF and for the
SDI/HDMI outputs (as described in Cine EI: Option One).
Custom LUT on VF
LUT on outputs