Microsoft continues to migrate legacy Windows tools into modern Windows 10 settings with the introduction of a new Disk Management tool. The new tool allows Windows users to view disk information, create and format volumes, and assign drive letters. Microsoft has also started testing redirecting Windows 10 users who opened the older System control panel to this new Windows 10 About settings page. The tool is not currently replacing the existing Disk Management MMC tool, and Windows users can still use it if they wish, and Microsoft has stated that this not currently replaces the existing tool.
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-settings-gets-a-modern-disk-management-tool/