https://www.bleepingcomputer.com/news/microsoft/a-closer-look-at-windows-10s-brand-new-start-menu/

During a Windows Insider webcast, Microsoft teased its vision for a new Windows 10 Start Menu that features partially transparent theme-aware tiles to showcase the new Fluent-based colorful icons.

Starting with Windows 10 version 20H2, which is now rolling out to seekers, Start Menu finally uses the theme-aware tiles.