By default, new organizations are configured to disallow the forking of private and internal repositories.
If you allow forking of private and internal repositories at the organization level, you can also configure the ability to fork a specific private or internal repository. For more information, see "Managing the forking policy for your repository."
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In the upper-right corner of GitHub AE, select your profile photo, then click Your organizations.
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Next to the organization, click Settings.
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In the "Access" section of the sidebar, click Member privileges.
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Under "Repository forking", select Allow forking of private and internal repositories.
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Click Save.
