Unlike modern versions of Adobe Animate, which are built on the UXP (Unified Extensibility Platform) and newer UI frameworks that allow for CSS-like styling, Flash CS6 relies on system-level drawing for its panels.

Adobe (the modern successor) has a native, beautiful dark mode. It also exports HTML5 Canvas, WebGL, and SVG—technologies that actually run on modern browsers (since Flash Player was killed in 2020).

The most effective "dark mode" for the actual work area is changing the Stage color. Users can go to the Properties panel and select a dark gray or black for the background to reduce glare while animating.