Microsoft has revealed a new Windows policy called ‘TargetReleaseVersionInfo’ that prevents Windows 10 feature updates from being installed. The new policy is only available for Windows 10 Pro and other enterprise versions and allows you to set a target version of Windows 10 that you want to use. This policy also prevents Microsoft from installing a later version until the specified version reaches the end of support. The Registry tweak is available in Windows 10 version 1803 or newer and is available only for Pro, Enterprise, and Education versions.
Source: https://www.bleepingcomputer.com/news/microsoft/this-registry-trick-lets-you-block-major-windows-10-updates/