How To Enlarge Images On Collection Page?

Shopify Partner
31 0 9

I'm testing two different themes.   On the theme "LaunchPad" the collection page shows very nice large images of the products.   On the other theme "MegaTronic" the product page show the same items but MUCH smaller.   I didn't see any option to adjust this in the settings.  Is this a limitation of the theme or is there a way to make the small product catalog images larger?   I've attached two screenshots showing the difference:

Here they are large:


Here they are SMALL



The store link is :