if you want it on the same line, just leave the style at “default”
However, if you do that you might have issues on small screens – but that depends on your theme and the number of prices/sizes you have for each item. hence the very existence of the “responsive” layout
alternatively, you can also mess around with the “element” attribute of the shortcode (https://docs.wp-pizza.com/shortcodes/?section=by-category) to move bits around and add required css