Deleting a label
In repositories where you have write access, you can delete a label if you no longer need it to classify issues or pull requests.
Deleting a label will remove the label from any issues or pull requests where it's been applied.
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On GitHub Enterprise, navigate to the main page of the repository.
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Under your repository name, click Issues or Pull requests.
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Above the list of issues or pull requests, click Labels.
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In the labels list, click Delete next to the label you want to delete.