[The video above is of our legacy layout. Up to date info is below.]
Here's a quick overview of what our default layout for Smash Ultimate looks like, and the basics of our unique buttons. You can access this layout by switching the second toggle switch (on the left side of your Smash Box) to the "I" position.
If there's buttons you wish were in other spots, don't fret! We have our Designer Software that allows you to map the buttons wherever you want, check out our blog post on how to do that: Button Remapping on Smash Box.