Wordpress - Disable Gutenberg blocks / Whitelist Blocks

whitelist-blocks.php

/*
** Reference: https://rudrastyh.com/gutenberg/remove-default-blocks.html
*/

add_filter( 'allowed_block_types', 'custom_allowed_block_types', 10, 2 );

function custom_allowed_block_types( $allowed_blocks, $post ) {

    $allowed_blocks = array(
        'core/paragraph',
        'core/image',
        'core/heading',
        'acf/custom-block-one',
        'acf/custom-block-two',
        'acf/custom-block-three'
    );

    
    if( $post->post_type === 'page' ) {
        $allowed_blocks[] = 'core/shortcode';
    }

    return $allowed_blocks;

}