Issue with first variable image being shown by default on Collection pages

I just updated the Turbo theme to take advantage of this item in the changelog:

• Resolved issue with first variable image being shown by default on Collection pages.
https://help.outofthesandbox.com/hc/en-us/articles/115007101668-Turbo-Changelog

Can anyone share how this was resolved? I would like the first image, and not the image attached to the first variable, to show on collection pages. How is this done?

Thanks