Resize the Images with PHP
There is no option to change the thumbnail sizes on the front-end. There is, however, a way to do it using PHP.
First, you need to add the following PHP code to your site:
add_filter('et_theme_image_sizes', 'db_resize_divi_gallery_images');
function db_resize_divi_gallery_images($sizes) {
unset($sizes['400x284']);
$sizes['225x225'] = 'et-pb-portfolio-image';
return $sizes;
}Related Post: Adding PHP to the Divi Theme
That will let you change the default size of the images. You can change the 225×225 part of the code to get a different size. Keeping the width / height the same will give you square images.
Finally, once the code is added you need to regenerate the images with a plugin such as this:
https://wordpress.org/plugins/regenerate-thumbnails/
Once installed, go to "WP dashboard > Tools > Regenerate Thumbnails" and click regenerate. You should only need to do it once to resize your existing images. After that, newly uploaded images should be resized correctly on upload.
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