<?php
/*adding sections for default layout options panel*/
$wp_customize->add_section( 'beauty-studio-button-design-option', array(
    'priority'       => 15,
    'capability'     => 'edit_theme_options',
    'title'          => esc_html__( 'Button Design', 'beauty-studio' ),
    'panel'          => 'beauty-studio-design-panel'
) );

/*button design*/
$wp_customize->add_setting( 'beauty_studio_theme_options[beauty-studio-button-design]', array(
    'capability'		=> 'edit_theme_options',
    'default'			=> $defaults['beauty-studio-button-design'],
    'sanitize_callback' => 'beauty_studio_sanitize_select'
) );

$choices = beauty_studio_button_design();
$wp_customize->add_control( 'beauty_studio_theme_options[beauty-studio-button-design]', array(
    'choices'  	=> $choices,
    'label'		=> esc_html__( 'Button Design', 'beauty-studio' ),
    'section'   => 'beauty-studio-button-design-option',
    'settings'  => 'beauty_studio_theme_options[beauty-studio-button-design]',
    'type'	  	=> 'select'
) );