I recently broke all the new features of Beta 3 over on my Twitter, and the general vibe I got was that people aren't a fan of the widened Quick Settings menu. I'm one of them.

Comparison between Beta 1 and Beta 3 in the Quick Settings screen.
The wider containers make the menu look odd, and the look of previous betas is generally favoured.
Also, while we're at it, the icon for Device Control is too large when using a third party provider, like Google Home.
Hopefully these quirks can be sorted in the next build.
Edit: I did some pixel peeping, as I was curious. Are the new Quick Settings menus the same as the containers within apps within One UI 7?
So I layered them on top of each other, and had a look.
You can see the individual pixels with this amount of zoom, and you can tell that the QS is slightly narrower than the containers, by a few px. Honestly, I'm not a fan of this change