Describe the bug

In 8.1.1, the empty state of controls addon has a bottom bar which wasn’t there before. The other empty states don't exhibit this. You can also see it in dark mode, but it's less evident because it's dark.

To Reproduce

https://stackblitz.com/github/storybookjs/sandboxes/tree/next/react-vite/default-js/after-storybook?file=README.md&preset=node

System

It's reproducible in the sandbox

Additional context

No response