How to customize/enhanced the SortBy field in Netlify CMS UI:

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Edit admin/config.yml and use the sortable_fields:

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    collections:

  - name: 'blog'

    ...

    sortable_fields: ['title', 'fields.date', 'fields.age' ]

    fields:

        - { label: 'Date', name: 'date', widget: 'datetime' }

        - { label: 'Age', name: 'age', widget: 'number' }

​

References:

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https://akhromieiev.com/how-to-change-the-sort-by-fields-in-netlify-cms/