Currently, Microsoft recommends using Appium with WinAppDriver as a UI testing tool for desktop and UWP applications.
WinAppDriver is a test framework developed by Microsoft as an open source project. It's an implementation of Appium which is primarily a Mobile App framework, itself based on Selenium. Therefore WinAppDriver is a Selenium-like automation framework combining the best of two worlds - encapsulating most of the technology of the now deprecated CodedUI and fusing it with the flexibility, easiness of use and adoption of Selenium.
This section in the documentation will walk you through the process of using WinAppDriver with the Telerik UI for WPF controls.