Allowing people to fork a private repository owned by your organization
Organization owners and people with admin permissions for a repository can allow or prevent the forking of a specific private repository owned by your organization.
Note: An organization owner must allow forks of private repositories on the organization level before you can allow or disallow forks for a specific repository. For more information, see "Allowing people to fork private repositories in your organization."
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On GitHub Enterprise, navigate to the main page of the repository.
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Under your repository name, click Settings.
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Under "Features", select Allow forking.
