Thank you!
I found:
https://docs-assets.developer.apple.com/published/459596b7a2/FrutaBuildingAFeatureRichAppWithSwiftUI.zip
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See on the page/download the code :
Availability
iOS 15.0+ Beta
macOS 12.0+ Beta
Xcode 13.0+ Beta
This version in the link is for iOS 15 - the iOS 14 version is gone.