Enable Refund :-
First you need to enable the Refund option from General Options. By enabling this option you will able to refund your user by using Crypto Wallets.
For general settings, navigate to the : WooCommerce >> Metamask Pro>>Settings >> General settings.
WooCommerce >> Orders >>Edit Order.
Note: Only order payed by Pay with MetaMask For Woo Commerce pro will be refunded by this option
You can check the refund status from Transaction list.
Also, You can check the refund status from Edit order.