I thought I should add a few other details. I’m using WooCommerce and the Vantage theme.
The settings I’ve tweaked:
WooCommerce/Settings/Products/Display/Product Images
Hard Crop? unchecked for Catalog Images, Single Product Image & Product Thumbnails
Settings/Media
Thumbnail Size/Crop thumbnail to exact dimensions – unchecked
I also used the Regenerate Thumbnails plugin with no changes observed.
I tried uploading a new non-square image and it still crops the widest dimension for the media library thumbnail.
Also what I really want is no forcing of my images into a square for thumbnails.