When my SwiftUI application runs under root privilege, why does NSOpenPanel exhibit .cancel behavior and not display the File Picker?

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This could be due to the fact that NSOpenPanel, like most macOS APIs, is designed to run within the context of a user-level process rather than a system-level process. Running an application under root privilege can cause system-level APIs to behave differently or fail to function altogether.

To resolve this issue, you can try running your application with standard user-level permissions instead of root privilege. Alternatively, you can investigate other ways to interact with the file system that are more suitable for use within a system-level process.