This is a filter to disable Multi-Currency in WooCommerce Payments. (gives higher priority 💯 to function)

functions.php

<?php // Do not copy this line.

// This is a filter to disable Multi-Currency in WooCommerce Payments.
add_filter(
	'pre_option__wcpay_feature_customer_multi_currency',
	function ( $pre_option, $option, $default ) {
		return '0';
	},
	100,
	3
);