Hello,
1/ Theme Options > Header builder > Main menu > Computed Box For The Menu Item > set 30px padding top and bottom
2/ Read this article – https://www.8theme.com/documentation/xstore/woocommerce/product-images/ , set size, and re-generate thumbnails using the plugin.
It is recommended to use a graphics editor and prepare product images (make them the same size) before uploading images to your media gallery.
Regards