Edit meta boxes

When you use a WordPress theme or plugin which integrates Meta Box, all the information of fields and meta boxes are fixed, such as: meta box title, number of fields, fields' names and descriptions, ... How to change these texts or add/remove fields of an existing meta box or even remove a meta box?
Assuming we have 2 meta boxes registered in a parent theme:
add_filter( 'rwmb_meta_boxes', 'prefix_register_meta_boxes' );
function prefix_register_meta_boxes( $meta_boxes ) {
    // 1st meta box
    $meta_boxes[] = array(
        'id'     => 'personal',
        'title'  => 'Personal Information',
        'fields' => array(
            array(
                'name'  => 'Name',
                'id'    => 'name',
                'desc'  => 'Enter your full name: First Last',
                'type'  => 'text',
            ),
            array(
                'name'  => 'Occupation',
                'id'    => 'occupation',
                'desc'  => 'What do you do?',
                'type'  => 'text',
            ),
        ),
    );
    // 2nd meta box
    $meta_boxes[] = array(
        'id'     => 'address',
        'title'  => 'Address Info',
        'fields' => array(
            array(
                'name'  => 'Street',
                'id'    => 'street',
                'type'  => 'text',
            ),
            array(
                'name'  => 'City',
                'id'    => 'city',
                'type'  => 'text',
            ),
            array(
                'name'  => 'State',
                'id'    => 'state',
                'type'  => 'text',
            ),
        ),
    );
    return $meta_boxes;
}
which are rendered as following:
We want to:
Remove "Personal Information" meta box
Change title of "Address Info" meta box to "Address"
Add description for field "Street" in "Address" meta box
Add field "zip_code" (text field) to "Address" meta box
Our custom code will be put in 
functions.php file of the child theme.
The principle is simple as following:
Hook to 
rwmb_meta_boxes filter with a high priority to get all registered meta boxes
Then we check meta boxes by ID or title to get the meta boxes we want to edit / remove
Remove or change meta boxes information if needed (such as meta box title)
For that meta box, we loop through all custom fields and change fields' info
And finally add more fields to that meta box if needed
The code is quite straight as following (with all necessary comments):
// Priority 20 makes sure all meta boxes are already registered
add_filter( 'rwmb_meta_boxes', 'prefix_edit_meta_boxes', 20 );
function prefix_edit_meta_boxes( $meta_boxes ) {
    // Loop through all meta boxes to find the ones we need
    foreach ( $meta_boxes as $k => $meta_box ) {
        // Remove "Personal Information" meta box
        if ( isset( $meta_box['id'] ) && 'personal' == $meta_box['id'] ) {
            unset( $meta_boxes[$k] );
        }
        // Edit "Address Info" meta box
        if ( isset( $meta_box['id'] ) && 'address' == $meta_box['id'] ) {
            // Change title to "Address"
            $meta_boxes[$k]['title'] = 'Address';
            // Loop through all fields
            foreach ( $meta_box['fields'] as $j => $field ) {
                // Add description for "Street" field
                if ( 'street' == $field['id'] ) {
                    $meta_boxes[$k][$j]['desc'] = 'Enter street address';
                }
            }
            // Add field "zip_code" to this meta box
            $meta_boxes[$k]['fields'][] = array(
                'name' => 'Zip code',
                'id'   => 'zip_code',
                'type' => 'text',
            );
        }
    }
    // Return edited meta boxes
    return $meta_boxes;
}
Here is the result:
:::tip
It is recommended to set meta box ID to make it easier to loop through all meta boxes.
:::