You've probably noticed the ratio for your product cover images and the thumbnails seen on the marketplace are different.
They are both optimized for their respectful location - but still different. As a result this can make some of the automatically generated thumbnails look a bit broken since we generate them using the center of the image as the base.
Sometimes this works great, but sometimes you'll want more control to get the perfect thumbnail.
Here's how to easily edit your thumbnails:
1. Click the top right icon when editing your product
2. Adjust the crop as desired - In this case the text would be cut in half with the default centered crop so I'm moving the box to the left for a better thumbnail
3. Admire your perfect thumbnail