Change homepage product image size

The quick way would be to simply add this to your custom CSS area:

ul.products li.product a img {
    max-width: 250px;
}

THe image size will still be 300px but will be displayed at no larger than 250px.

If you wish to change the actual image size then you will have to override the function that defines the images sizes of the theme using your Child Theme functions.php file.

Hope this helps.

I want the images to be 300 wide but 250 tall. Will this do that?

I see your code says max-width: 250px

As mentioned above, you can change the size of the actual theme images using a Child Theme, but as you’re using a commercial product you’ll need to seek assistance from where you purchased the from as we’re not supplied commercial products to be able to test with, as per the Forum Welcome.