Make it responsive
Aside from being able to preview the Spotlight feed on different devices within your editor, you can also customize different design options per device.
For example, you can set up your feed to display a 9-post grid on desktop and tablet, but a 3-post grid on phones.
This can be taken even further to display buttons only on certain devices, give site visitors a "Load more posts" button only on specific devices, and much more.
This ensures that your feeds are kept fully responsive no matter what device your site visitors are using.