https://wccftech.com/windows-10-21h1-wont-be-a-major-update/

Microsoft delivers two feature updates to Windows 10 every year. For the past two years, the company has followed a major-minor format, with H1 getting major features and H2 update being more of a minor release.

However, this year, the Windows maker is reportedly planning another minor release with Windows 10 21H1. By this time, Windows Insiders are usually moved to testing builds from H2 update, but there hasn't been any such move so far as builds remain untagged and unassociated with any feature update, as the company plans to attach builds with a particular version once they move to the slower, more stable channels of the Windows Insider Program.