Altering Woocommerce product page

Hi,

I’ve installed woocommerce and the product page seems to be split 50/50 between image and heading (excluding sidebar).

https://moneytrees.uk/product/property-lead-ol12-market-value-125000/

Ideally I would like the image taking up one third and the heading taking up two thirds but I can’t see where I edit this.

Please can you point me in the right direction.

Thanks,
Ian