Microsoft has unveiled the new Windows 10 Start Menu and its transparent tiles. Windows 10 Insider build 20161 is the latest version of the Windows 10 software. The new tiles are partially transparent and will assume the Start Menu background color when you switch from Light to Dark. Custom themes can also be added to Windows 10’s Start Menu with a custom accent color. Microsoft says the new tiles will be released to everyone in a future feature update next year. The feature is expected to be rolled out in the next Windows Insider build.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-unveils-new-windows-10-start-menu-with-theme-aware-tiles/