How does the 'Where to show the effects' option work?

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

When the option 'Only on home page' is selected, the animation effects and decoration will be displayed only on the 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 'On all public pages' is selected, 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: