The unBlock theme (free) gives you 3 layout options, while the premium version gives you one more.
- Classic Left Sidebar
- Classic Right Sidebar
- Centered No Sidebars
The premium version will add a minimal style as your fourth option. This will be a very basic concept with only the article and comments being displayed; ideal if you want to keep things very simple without using featured images.
- Go to Appearance > Customize > Layout Options
- Look for the Post Style setting and make your choice from the dropdown list.
- Click the Publish button.