Remove the default Patterns included into WordPress

remove-default-patterns.php

<?php
/**
 * Prevent the loading of patterns from the WordPress.org Pattern Directory
 */
add_filter( 'should_load_remote_block_patterns', '__return_false' );

/**
 * Remove patterns that ship with WordPress Core.
 */
function bbfs_remove_core_block_patterns() {
	remove_theme_support( 'core-block-patterns' );
}
add_action( 'after_setup_theme', 'bbfs_remove_core_block_patterns' );