What localization of ARCHICAD do you have? You don't have a signature showing that and your OS, which would help people give you more specific answers.
You're looking at the library with the Object Tool (chair icon) selected?
If you're not USA, which is where this division 10 is... simply use the search box in the Object Settings dialog at the top left (seen in my screenshot) and search for "Bath Stall" and it should show up.
One of the forum moderators • AC 25 USA and earlier • MacOS 11.6, iMac Pro
For some reason - and I don't gasp as I am trying to spend more time as Architect and not tech.
The libraries don't always show. And sometimes I have to open and keep opening and more show.
I searched for partitions initially and no show.
My setup is a default set up as I dont have the customization required for something special yet.
Eric Milberger, Architect | Master Planner
Windows 10 64bit