Adds a rules column to ACF field groups overview

hip_acf_columns.php

<?php
add_filter( 'manage_edit-acf-field-group_columns', 'hip_acf_columns', 9999 );
add_filter( 'manage_acf-field-group_posts_custom_column', 'hip_acf_columns_html', 9999 );
function hip_acf_columns( $columns ) {
    $columns['rules'] = __( 'Rules', THEME_TEXTDOMAIN );
    return $columns;
}
function hip_acf_columns_html( $column, $post_id ) {

    $field_group = get_post( $post_id );

    $rules = unserialize( $field_group->post_content );
    $location = isset( $rules['location'] ) ? $rules['location'] : false;


    if( $column == 'rules' && $location ) {

        $groups = count( $location );
        $i = 0;
        foreach ( $location as $group ) :

            if( $groups > 1 && $i > 0 ) echo "<strong>OR</strong>";
            echo "<ul style='border:1px solid #EEE;padding:5px'>";
                foreach ( $group as $item ) :
                    echo "<li>" . $item['param'] . " " . $item['operator'] . " " . $item['value'] . "</li>";
                endforeach;
            echo "</ul>";
            ++$i;
        endforeach;

    }

}