Change to "new" librarything website design

Hello,
Probably a stupid question but I'm a little bit stumped on how to change from the "old" librarything to the new design? I'm still seeing my profile on the very old design of the website and I can't find a way to change it anymore in any of the settings.

The page below might be what you're looking for.

https://www.librarything.com/design_choice.php

That's exactly what I was looking for, thank you!

Okay ... I really hate the new design. Especially that locked right column about the group. I already know what group I'm currently looking at, I don't need that so prominently displayed on my page all the time. I'd rather see more of the current topics.