fields.php

<?php
use Carbon_Fields\Container\Container;
use Carbon_Fields\Field\Field;

$general_block = [
    Field::make('text', 'plain_text_block'),
    Field::make('rich_text', 'rich_text_block'),
];

$media_block = [
    Field::make('image', 'image_block'),
    Field::make('textarea', 'video_embed_block'),
];

$advanced_block = [
    Field::make('map', 'map_block'),
];

Container::make('custom_fields', __('Home Page Blocks', 'crb'))
    ->show_on_page('home')
    ->add_fields([
        Field::make('complex', 'home_blocks')
            ->add_fields('general', $general_block)
            ->add_fields('media', $media_block)
    ]);

Container::make('custom_fields', __('About Page Blocks', 'crb'))
    ->show_on_page('about')
    ->add_fields([
        Field::make('complex', 'about_blocks')
            ->add_fields('media', $media_block)
            ->add_fields('advanced', $advanced_block)
    ]);

Container::make('custom_fields', __('Contact Page Blocks', 'crb'))
    ->show_on_page('contact')
    ->add_fields([
        Field::make('complex', 'contact_blocks')
            ->add_fields('general', $general_block)
            ->add_fields('media', $media_block)
            ->add_fields('advanced', $advanced_block)
    ]);