About auto-closing issues
By default, merging a linked pull request automatically closes the associated issue. You can override the default behavior by disabling auto-closing.
Enabling or disabling auto-closing of issues
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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 General, scroll down to the Issues section.
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Select or deselect Auto-close issues with merged linked pull requests to enable or disable auto-closing.