Reply To: Smaller Thumbnail Image Size

Hello,

Have you tried to configure your images in Appearance > Customize > WooCommerce > Product Images

http://prntscr.com/jkize1

You can reduce product grid image in Theme Settings > Shop > Products grid > set max number of product in a column.

If you display categories by the Category element, setting less number of categories in a row will make them bigger.

Best Regards