About auto-merge
If you allow auto-merge for pull requests in your repository, people with write permissions can configure individual pull requests in the repository to merge automatically when all merge requirements are met. If someone who does not have write permissions pushes changes to a pull request that has auto-merge enabled, auto-merge will be disabled for that pull request. For more information, see "Automatically merging a pull request."
Managing auto-merge
Note
The option to enable auto-merge is shown only on pull requests that cannot be merged immediately. For example, when a branch protection rule enforces "Require pull request reviews before merging" or "Require status checks to pass before merging" and these conditions are not yet met. For more information, see "Managing a branch protection rule."
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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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On the left side of the page in the navigation bar, click General
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Toward the bottom of the page under "Pull Requests", select or deselect Allow auto-merge.
