Pro Tools 12.5 was a significant release for Avid in March 2016, it does not natively support Dark Mode
Users looking for a Dark Mode experience must upgrade to version 2020.11 or later. This version added: pro tools 12.5 dark mode
However, you can still darken your Pro Tools 12.5 interface using the following manual methods: 1. Adjust Color Palette (Darkening Tracks & Backgrounds) Pro Tools 12