Step 1: Edit the settings and in Advanced Tab > CSS Class set a custom CSS class for it, for example dt-blog :

Step 2: In Design Tab > Layout set the Blog Module to have the Fullwidth layout

Step 3: In Divi ➤ Theme Options ➤ Custom CSS add the following CSS Code:

@media only screen and (min-width: 1080px) {
    .dt-blog .et_pb_post.has-post-thumbnail .entry-featured-image-url {
        float: left;
        width: 30%;
        margin-right: 4%;
    }
    .dt-blog .et_pb_post.has-post-thumbnail:not(.format-gallery) > .post-content {
        padding-left: 34%;
    }
}

The result will be:

Code Explanation:
In the above code, the width of the Feature image is set to be 30% and the space between the Featured Image and the Post content is set to be 4%, that means we need to set on the Post Content a padding-left of 34% (30 + 4 = 34).

In case you will want to use different Featured Image Size and a different space, don't forget to update the CSS code accordingly.

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