The bigbusiness.com web site got a new framework for 2022. Function and layout are largely the same. Brash, brisk, and brief are the new guidelines. Some icons have been changed to protect their innocence. The purpose of the web site is to host online help.
The hope is that you click around and find some Solutions, Chapters, or Contents, and find something new that you can adopt, adapt, and iterate on.
The content of Big Business changes frequently, but the program stays the same. Changes are often additions, an option you turn on to do things differently, or not. So it is always perfectly safe to ignore the changes and keep doing what you're doing.