You can use the following filter to change the default “Select” prefix of WooFood Extra options.
Change only the “Your Own Prefix” to the one you want to use or you can remove it at all , without removing the quotes.
Note: Copy the snippet inside your functions.php on your child theme.
add_filter("woofood_extra_option_prefix", "woofood_change_select_prefix");
function woofood_change_select_prefix()
{
return "Your Own Prefix";
}