If you want to change blog page layout to this.
You can use this to Custom CSS box
/* Blog Page layout */ .blog-basic-grid .blog-basic-grid--container:first-child { grid-column: ~"1 / 3"; }
If you want to apply this for a specific blog page, you can find the Blog Page ID.
In my example, we will have:
- #collection-6677756d03a4f15ba27ce9d8
Next, use this CSS code
#collection-6677756d03a4f15ba27ce9d8 .blog-basic-grid--container:first-child { grid-column: ~"1 / 3"; }