How to Hide the "Admin Columns" Admin Menu

function plt_hide_codepress_admin_columns_menus() {
	//Hide the "Settings → Admin Columns" menu.
	remove_submenu_page('options-general.php', 'codepress-admin-columns');
}

add_action('admin_menu', 'plt_hide_codepress_admin_columns_menus', 11);

Where do I put this code?