Hi there,
You can use this filter:
add_filter( 'generate_woocommerce_menu_item_location', function() {
return 'secondary';
} );
Adding PHP: https://docs.generatepress.com/article/adding-php/
You’ll need to add this code as well for now until 1.8.0-beta.1:
.secondary-nav-aligned-right .secondary-navigation ul.woocommerce-mini-cart,
.secondary-nav-aligned-center .secondary-navigation ul.woocommerce-mini-cart {
font-size: inherit;
}