@ - ProjectDisplayedTitle is on the Description page of the project settings. It’s the fallback value for the app’s (localizable) display name that goes into the UWP manifest, but it might not be the best setting to rely on: changing it will affect any other platforms your game targets, plus there can be localization issues.
The solution I’d recommend instead depends a bit on what commit you’re at. If you’re on the very latest you should fine a settings group on the UWP page labeled ‘Neutral Resources’ that maps directly (and only) to manifest content; and then there’s a corresponding ‘Localized Resources’ group that allows you to selectively override. Some older versions instead have you provide localized strings in resw files that live in your project’s Build/UWP folder. These get autogenerated (if missing) with the necessary structure on build, after which you can go edit strings as necessary and build again.
@Chiako3D - This fork has the components you need to get started with the Creators Program. There’s a fair amount of info up-thread. Essentially you collect some ids from the Windows Developer Portal, enter them carefully into your UWP project settings making sure to check the ‘Is Creators Program Title’ box, and enable the OnlineSubsystemLive plugin.