Owners can set permissions for deleting or transferring repositories in an organization.
Limiting the ability to delete or transfer repositories helps prevent sensitive information from being exposed. For more information, see Best practices for preventing data leaks in your organization.
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In the upper-right corner of GitHub, click your profile picture, then click Organizations.
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Select an organization by clicking on it.
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Under your organization name, click Settings. If you cannot see the "Settings" tab, select the dropdown menu, then click Settings.

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In the "Access" section of the sidebar, click Member privileges.
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Under "Repository deletion and transfer", select or deselect Allow members to delete or transfer repositories for this organization.
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Click Save.