When you disable project boards, you will no longer see project board information in timelines or audit logs.
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On your GitHub Enterprise Server instance, 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 project boards are disabled, existing project boards are inaccessible at their previous URLs. If you decide to re-enable project boards, any project boards that were previously added will be available.