If you're using an iOS 14+ iPad, you'll see a sidebar to give you access to top-level locations in Showbie. In this case, you can navigate between classes quickly.
When you login to Showbie, there's a new icon near the top-left corner:
Tap this icon to open the sidebar:
A. Here, you get an overview of your classes and you can navigate between them quickly.
B. Your profile menu is now at the bottom-left corner. If you're looking for this, here's where you can find it!
The sidebar button will always be available to you even if you're in an assignment.
You can even create a class through this menu!
Keep in mind as well, your profile menu is now at the bottom-left corner.