If you disallow publication of GitHub Pages sites, any sites that are already published will remain published. You can manually unpublish the site. For more information, see "Unpublishing a GitHub Pages site."
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In the top right corner of GitHub Enterprise Server, click your profile photo, then click Your organizations.
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Next to the organization, click Settings.
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In the left sidebar, click Member privileges.
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Under "Pages creation", select or deselect Allow members to publish sites.
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Click Save.