Released 2020 July 02 (build 44.7.17)
Library: Category improvements
All Users: When you click on a Category in your Library, its Volumes will now be displayed in the main view instead of just the side panel, making it easier to find what you're looking for.
Library: Updated action bar
All Users: The action bar at the top of Library has been updated to our current design standards, making it consistent with other views and providing better context of what is being viewed.
Librarians: The "Add New" feature has been updated as well and is now indicated by the “+” icon.
PLUS 58 other bug fixes and/or performance enhancements.
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From the Developer's Dictionary:
G is for grok – to understand thoroughly and intuitively