Microsoft has introduced new Windows Security app improvements including the ability to set up Tamper Protection and Protection History. Microsoft is working on several important improvements such as the Light Theme, new Settings page UI, brightness slider and more for Windows 10. The app will still show you detections by Windows Defender Antivirus but you will notice that the page would display more detailed and easier to understand information about threats and available actions. The recommendations should help users learn more about malware infection and how the computer can be better protected.
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-19h1-update-to-introduce-windows-security-app-improvements/