For Movedo theme: Add some divs to create 2 columns for Billing Address and Payment Information Fields at membership checkout.

pmpro_checkout_columns_for_movedo_theme.php

<?php
/**
 * Add some divs to create 2 columns for Billing Address and Payment Information Fields at membership checkout.
 */

function pmpro_checkout_columns_divs_after_user_fields() {
	echo '<div class="grve-row"><div class="grve-column wpb_column grve-column-1-2">';
}
add_action( 'pmpro_checkout_after_user_fields', 'pmpro_checkout_columns_divs_after_user_fields', 1 );

function pmpro_checkout_columns_divs_after_billing_fields() {
	echo '</div><div class="grve-column wpb_column grve-column-1-2">';
}
add_action( 'pmpro_checkout_after_billing_fields', 'pmpro_checkout_columns_divs_after_billing_fields', 1 );

function pmpro_checkout_columns_divs_checkout_before_submit_button() {
	echo '</div></div>';
}
add_action( 'pmpro_checkout_before_submit_button', 'pmpro_checkout_columns_divs_checkout_before_submit_button', 99 );