Refined - How to edit the home page image sizes and control them with Genesis Settings
If you'd like the post on your home page to all be the same as your blog page where you can control the sizes of your images with the Genesis theme settings, you will do the following:
Navigate to Appearance > Editor and edit the front-page.php file and REMOVE the code that you see below.
If you'd like all the post to appear one right after the other and not side by side, you'll navigate to Appearance > Editor and edit the style.css file and REMOVE the code that you see below.
Now you can edit the image sizes under Genesis > Theme Settings.