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Removes a section from the Theme Customization admin screen.
This is a method of the WP_Customize_Manager class and can only be accessed through the $wp_customize object within the customize_register action hook.
$wp_customize->remove_section($id);
WordPress does include a few built-in sections. The following sections are built-in...
Removing a theme section (within the 'customize_register' action) might look like this:
$wp_customize->remove_section( 'mytheme_new_section_name' );