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<?php
// Code goes in child theme’s functions.php.
// Add support for structural wraps
add_theme_support( 'genesis-structural-wraps', array(
    'header',
    'menu-primary',
    'menu-secondary',
    'site-inner',
    'footer-widgets',
    'footer'
) );

// Remove default wraps by removing the named element that should no longer contain the wrap.

// Ex.: To remove .site-inner’s .wrap:

// Add support for structural wraps
add_theme_support( 'genesis-structural-wraps', array(
    'header',
    'menu-primary',
    'menu-secondary',
    // 'site-inner',
    'footer-widgets',
    'footer'
) );

// To remove support for all structural wraps at once:

// Remove support for structural wraps
remove_theme_support( 'genesis-structural-wraps' );