Thumbnails below main image? (Single product page)

Hi,

I'm setting up GPP (using Niche) with WooCommerce.

On the single product page, when viewed on desktop, this template gives a long column of large images, resulting in the description being way too far below.

I prefer a single image with a strip of clickable thumbnails below. (Actually, when viewed on mobile, I get this desirable outcome.)

Short of switching to the Merch template which provides this, is there a way to achieve this?

Thanks,
Richard

P.S.
Side note:
Customizing - WooCommerce - Product Images:
Main image width (default 600)
Changing this is not having any effect on image width on any full size images.
No biggie but curious why.