Size of thumbnails or wide of the page´s columns

Hello! I think that it is my final question to create my Woocommerce shop 😀

To my shop of clothes I´ve created some pages using categories of products on the menu bar (A page with “T-shirt” categores , other with ” trousers” categories…)

The problem that i’ve got now it’s the size of the thumbnails of the categories page are smaller than the main shop page (or the colums of this page are too narrow) so the buttom of add to cart is in two lines and it’s look horrible!

How can I make the thumbnails biger to repair it? Is it a problem of woocommerce or the theme that I’ve had? (I try it in other themes and the problem continues)

im a bit desperate jajaja

Thank you very much!

Best regards from Spain again!