Disabling projects in a repository
When you disable projects in a repository, linked projects will no longer be available in the repository's Projects tab. Linked projects will remain accessible at an organization or user level.
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On GitHub, navigate to the main page of the repository. 
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Under your repository name, click Settings. If you cannot see the "Settings" tab, select the dropdown menu, then click Settings.  
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Under "Features," deselect the Projects checkbox.