Change the breakpoint for woocommerce-smallscreen.css

woocommerce-smallscreen-filter-breakpoint.php

// Don't add this opening PHP tag unless your file doesn't already have one
<?php

// Define a new breakpoint for woocommerce-smallscreen.css
function marce_filter_woocommerce_style_smallscreen_breakpoint( $breakpoint ) { 
    $breakpoint = '200px';
    return $breakpoint; 
}; 
add_filter( 'woocommerce_style_smallscreen_breakpoint', 'marce_filter_woocommerce_style_smallscreen_breakpoint', 10, 1 );