<?php // Optional Widget Areas
$wp_customize->add_panel( 'owa', array(
    'capability'	 => 'edit_theme_options',
    'theme_supports' => '',
    'title'		  => esc_html__( 'Optional Widget Areas', Ace::TEXTDOMAIN ),
    'description'	=> '',
) );

    // Wrapper
    require_once( 'owa/wrapper.php');

    // Area
    require_once( 'owa/area.php');