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<?php
//do not copy above opening php tag when pasting into a functions.php file

//Full Width Pages on WooCommerce
function themeprefix_cpt_layout() {
    if( is_page ( array( 'cart', 'checkout' )) || is_shop() || 'product' == get_post_type() ) {
        return 'full-width-content';
    }
}
add_filter( 'genesis_site_layout', 'themeprefix_cpt_layout' );

<?php
//do not copy above opening php tag when pasting into a functions.php file

//Full Width Pages on WooCommerce
function themeprefix_cpt_layout() {
    if( is_page ( array( 'cart', 'checkout' )) || is_shop() || 'product' == get_post_type() ) {
        return 'content-sidebar';
    }
}
add_filter( 'genesis_site_layout', 'themeprefix_cpt_layout' );