How to Hide Builder Shortcode Extras Admin Menus

function plt_hide_builder_shortcode_extras_menus() {
	//Hide the "Blocks" menu.
	remove_menu_page('edit.php?post_type=wp_block');
	//Hide the "Blocks → Blocks" menu.
	remove_submenu_page('edit.php?post_type=wp_block', 'edit.php?post_type=wp_block');
	//Hide the "Blocks → Add New" menu.
	remove_submenu_page('edit.php?post_type=wp_block', 'post-new.php?post_type=wp_block');
}

add_action('admin_menu', 'plt_hide_builder_shortcode_extras_menus', 21);

Where do I put this code?