How to create a theme customizer ‘sub’ panel?
You create Panels, and put Sections inside those Panels. So if you have your panel: $wp_customize->add_panel( ‘panel_id’, array( ‘priority’ => 10, ‘capability’ => ‘edit_theme_options’, ‘theme_supports’ => ”, ‘title’ => __(‘Theme Options’, ‘mytheme’), ‘description’ => __(‘Several settings pertaining my theme’, ‘mytheme’), ) ); Then you need to add your sections: $wp_customize->add_section( ‘header_settings’, array( ‘priority’ => 10, … Read more