How does the 'Only at home page' option work?

Saint Patrick's Day allows showing the effects only on the home page with a single click:

When the option is enabled, the animation effects and decoration will be displayed only on home page. 

In the screenshot below we can see the app running on the home page:

On all other pages there won't be any effect or decoration:

When the option is disabled, the app will be displayed on all pages, regardless whether it is the home page, a collection page, a product page, a corporate page or a blog page: