Full Layout: Large Image Top, Full Content Below (Pro only)
In order to show your blog posts in a grid format, go to Appearance > Customize > Blog Feed and change the Post Display Format.
Choosing this will show the full size featured image at the top and the full post content at the bottom.
If you use the “more tag” you can control how much content is visible in the blog feed and the user can click “more” to view the complete post.
View a demo here.
More on the different post layouts can be found here.