hide_recurring_option_for_offline_payment.php

<?php
function hide_recurring_option_for_offline_payment() { ?>
	<script>
		let paymentMethodOff = jQuery('input[value="offline"]');
		let recurringOption = jQuery('div.give-recurring-donors-choice');
		let recurringData = jQuery('input[name="_give_is_donation_recurring"]');

		if(true === paymentMethodOff.prop('checked')) {
			recurringOption.prop('checked', false);
			recurringData.prop('value', 0);
			recurringOption.hide();
		} else {
			recurringOption.show();
		}
	</script>

	<?php
}

add_action( 'give_donation_form_after_submit', 'hide_recurring_option_for_offline_payment' );