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Magento 2 didn't provide the checkout reorder/sort checkout fileds at admin side, you can reorder/sort checkout fields using code.
Try the below solution,
First way:
Override the checkout_index_index.xml file in your custom module or theme, and add the below code.
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:...
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