Library parts are filtered based on the object tool - even though all object-related tools bring up that same dialog.
If you saved your object as a window, it will not show up with the object tool, only the window tool, for example. Doors only show up with the door tool. Etc.
Karl
AC 28 USA and earlier • macOS Sequoia 15.3, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB
One of the forum moderators