When you disable classic projects, you will no longer see classic project information in timelines or audit logs.
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On GitHub.com, 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," unselect the Projects checkbox.
After classic projects are disabled, existing classic projects are inaccessible at their previous URLs. If you decide to re-enable project boards, any project boards that were previously added will be available.