How i can change the size of thumbs?

Right now, you can do this in the admin.

If you visit the Tools -> Database and then click on 'Edit Bread' for products. Scroll down to the image field and to the very right you will see some advanced details in JSON format that looks like this:

{
    "resize": {
        "width": "700",
        "height": "null"
    },
    "quality": "70%",
    "upsize": true,
    "thumbnails": [
        {
            "name": "cropped",
            "crop": {
                "width": "600",
                "height": "500"
            }
        }
    ]
}

You can change the width and height above inside of the crop key, and that will be the new size that product thumbnails will have :)

Let me know if that makes sense.

Thanks.

Hi, follow the @devdojo code.