Microsoft released Windows 10 Insider Preview 20H1 Build 18912 for users in the Fast Rings. With it come three new features that let you control the amount of bandwidth used when downloading Windows updates. Users will be allowed to set the absolute, or exact, bandwidth amount in Mbps that they wish Windows Update to use. Another hidden feature that can be enabled is a new Quick Compose for the Windows 10 Calendar. The new notification settings page has also been redesigned to provide examples of what each setting does.
Source: https://www.bleepingcomputer.com/news/microsoft/three-hidden-features-found-in-next-windows-10-version/