Press Left Alt + Left Shift + Print Screen to toggle Windows High Contrast Mode. You can customize a high-contrast theme with a black background and neon text, which forces Pro Tools 12.5 to drop its bright gray window borders.
Since Avid omitted a native dark theme in version 12.5, developers created third-party software to modify the user interface. Pro Tools Themes (PT Themes) pro tools 12.5 dark mode