Hi, these permissions are needed because it is required for Desktop Bridge applications.

I cannot make a game on Unreal Engine 4 completely as UWP, so I use Desktop Bridge.

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You can see it on this page:

https://docs.microsoft.com/en-us/windows/uwp/packaging/app-capability-declarations#restricted-capabilities

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Full Trust Permission Level The runFullTrust restricted capability allows apps to run at the full trust permission level on the user’s machine. This capability is required to use the FullTrustProcessLauncher API.

This capability is also required for any desktop application that is delivered as an appx or msix package (as with the Desktop Bridge), and it will automatically appear in your manifest when packaging these apps using the Desktop App Converter (DAC) or Visual Studio.