Adjustment of the sector/zone color is set in the Configurator.

Each scanner in a multi-scanner system can have a unique color. Each ini file can have a unique color.

It is covered as a shorter form summary on page 24 of the DTDP manual revK Dec 2019.

The graphic also highlights how you can select an alternative thermogram palette and even modfiy individual colors. In this example an "isotherm" is created - top temperatures (scale adjusted in runtime) are red, all others fit to grayscale.