system

Contains an array of system field configuration values.

'system'=> [
    'default' =>[
        'checkout' => [
            'cart' => [
                'delete_quote_after' => 31
            ]
        ]
    ]
]

Learn more about System-specific Configurations.

themes

Contains an array of values for theme configuration.

'themes' => [
  'frontend/Magento/luma' => [
    'parent_id' => 'Magento/blank',
    'theme_path' => 'Magento/luma',
    'theme_title' => 'Magento Luma',
    'is_featured' => '0',
    'area' => 'frontend',
    'type' => '0',
    'code' => 'Magento/luma'
  ]
]

Learn more about Themes.

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