Besides the new interface, here is a list of some of the new features and improvements on WinDbg.
You can try to see if you can install WinDbg Preview from the Windows Store https://www.microsoft.com/en-us/store/p/windbg/9pgjgd53tn86 or download and install the Stable version here. https://developer.microsoft.com/en-us/windows/hardware/download-windbg
Before installing the Preview version, remember that you are using advanced development tools so if you are not sure if you can work with bugs, wait for the stable version.