rwmb_meta object_type settings in rwmb_meta_boxes

Hi I have a meta-box that shows fields in pages and posts. Also I have a settings page with a checkbox field that when disabled should hide the meta-box in the pages/posts and show another one.

I tried to insert this, but the variable $enable is not loaded:

add_filter( 'rwmb_meta_boxes', 'sidebar_post' );

function sidebar_post( $meta_boxes ) {

    $enable = rwmb_meta( 'enable', array( 'object_type' => 'setting' ), 'my_settings' );

    if ( $enable ) {
        
        $meta_boxes[] = [
            'title'      => __( 'Set View', 'my-name' ),
            'id'         => 'set-view',
            'context'    => 'side',
            'fields'    => [
                [
                    'type' => 'custom_html',
                    'std'  => '<div class="alert alert-warning">My first custom message here.</div>',
                ],
            ],

        ];

    } else {

        $meta_boxes[] = [
            'title'      => __( 'Set View', 'my-name' ),
            'id'         => 'set-view',
            'context'    => 'side',
            'fields'    => [
                [
                    'type' => 'custom_html',
                    'std'  => '<div class="alert alert-warning">My second custom message here.</div>',
                ],
            ],

        ];

    }

    return $meta_boxes;
}