When you disable classic projects, you will no longer see classic project information in timelines or audit logs.
On GitHub.com, navigate to the main page of the repository.
Under your repository name, click Settings. If you cannot see the "Settings" tab, select the dropdown menu, then click Settings.
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.