Install all the latest updates, on server config open command line (powershell) and type Set-PreviewChannel.
For GUI, HCI related setup packages have to be removed. And, most importantly, the creation must be made by official reconstruction way, not manually by dism. Not easy.
The Client is useless alike 17763 to 17784 being Without Update Support. [17784] Useless 17763 Client --> change build --> 17784 Client --> Without Update Support Useful 17763 ServerCor + AzureStackHCI components --> change build --> 17784 AzureStackHCICor --> With Update Support
20384ServerAzureStackHCICor+GUI(Microsoft-Windows-Server-DesktopUX-Package+Microsoft-Windows-Server-DesktopUX-WOW64-Package+Server-LanguagePack-Package)