Some versions of Windows 11 will ship with a dark theme by default

During the Microsoft Inspire event, the company said that in versions of the Windows 11 operating system for commercial use, the dark theme of the interface will be active by default. Windows 11 dark theme

Since we spend so much more time staring at bright screens, not only for endless checking emails, but countless meetings and personal tasks, we need to give our eyes a rest .– Melissa Grant, Director of Marketing for Windows Enterprise 

For those who wish to enable the light interface theme, such an option will be available in the operating system settings. Consumer builds of Windows 11 will continue to ship with a default light theme. Microsoft is currently testing six themes and several wallpaper options for Windows 11, and other design styles may be introduced next year as part of the Windows 11 version 22H2 update.