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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 Issues.
If you decide to enable issues again in the future, any issues that were previously added will be available.
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To restrict issues to collaborators only, in the dropdown under "Issues" select Collaborators only.
In personal repositories, a collaborator is anyone who has been invited to the repository. For more information, see Permission levels for a personal account repository.
In organization repositories, a collaborator is a user who has been granted the write, maintain, or admin role for the repository. For more information about organization roles, see Repository roles for an organization.
Tip
Please contact us through the GitHub Support portal if you want to turn off issues because of abuse from strangers. GitHub does not tolerate abuse. For more information on GitHub's policies, see our Terms of Service and Community Guidelines.