Hi

although you could do this with the filters available
(https://docs.wp-pizza.com/developers/?section=wppizza-markup-loop-posts-prices-php)
for your own sanity , i would probably suggest you use/make a copy of the posts.prices.php template as outlined here
https://docs.wp-pizza.com/developers/?section=modify-templates-readme
under “EDITING FILES DIRECTLY – ONLY IF FILTERS/ACTIONS CANNOT BE USED”
and simply moving the relevant elements around

i.e move

$markup['post_price_'.$key.'_span'] = '<span>' . $price['price'] . '</span>';

AFTER

if(empty($price['no_label'])){
   $markup['post_price_'.$key.'_label'] = '<div class="' . $price['class_size'] . '">' . $price['size'] . '</div>';
}

instead of where it is now (so just reverse the two locations of those parts of the script)

not thoroughly tested , but should work i would think

hope that helps