Since the introduction of dark mode to File Explorer, Windows users have encountered a “white flash” when opening or maximizing a File Explorer window. This bug is over five years old and remains a major annoyance. But Microsoft is finally doing something about it. The latest Windows 11 Insider build (22621.2338, or 22631.2338 for Beta Channel testers) introduces several bug fixes and improvements, including a fix for the “white flash” issue.
Source : Dark Mode in Windows 11 Is Getting a Much-Needed Improvement
