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The XCode 11 "whats new" page [0] says:

>To use the SwiftUI design canvas Xcode 11 must running on macOS Catalina.

Please let us know if you find that's incorrect.

[0] https://developer.apple.com/xcode/whats-new/

Check the “Applications” tab, the Xcode download is there (they redesigned the page, which makes it IMO worse). No idea if it runs on Mojave, but I would think so based on history.

Under Applications now: Xcode 11 beta