Windows 10 cumulative update KB4505903 advances PCs to Build 18362.267 and fixes issues with Windows Hello, Microsoft Edge, and other features. The update is an optional update and you have to click on a new ‘Download and install’ option on Windows Update settings page to apply the patch. Microsoft has also fixed an issue that may have prevented users from applying a new brightness level to their devices. A bug that broke PDF printing feature in Microsoft Edge has been resolved and the browser should able to launch PDFs that are configured only once correctly.
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-version-1903-cumulative-update-kb4505903-released/