How to increase the Product image boxes

Hello
I have your WooCommerce Thank You Page Customizer Premium
and I would like to add extra products to the thankyou page
like an upsell or we recommend the following products .

I have added a 4 column and selected 4 products without slide show
unfortunatley the images and text underneath are a bit on the small side
is there anyways I can display bigger images like you can if you can in you have 1 column

I would like to display 4 product images with a decent size next to each other
and not 4 products under each other

Thanks