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In project properties - > API Versioning : Public Package list allows selection of only one element at a time which makes it difficult to check large number of elements.
reassigning to projects
I guess it's about apisupport module.
Although it is generally discouraged to export many packages from a module, it might be useful for library wrapper modules.
You can use <subpackages> in project.xml but we provide no GUI for it.
Space, down arrow, Space, down arrow, ...