Search Engine Robots Default Robots This will be included before head closing tag in page HTML. Magento\Config\Model\Config\Source\Design\Robots Edit custom instruction of robots.txt File Magento\Config\Model\Config\Backend\Admin\Robots Reset to Defaults Magento\Backend\Block\Page\System\Config\Robots\Reset This action will delete your custom instructions and reset robots.txt file to system's default settings.