That Palette shows only the Favorites defined for the Tool.
In order to see all available object in the Library activate the Object Settings Dialog by either double-clicking the Tool in the Toolbox, or selecting the Tool in the Toolbox and then clicking the Tool icon in the Info Box, or selecting the Tool in the Toolbox and pressing CTRL+T on the keyboard.
Loving Archicad since 1995 - Find Archicad Tips at x.com/laszlonagy
AMD Ryzen9 5900X CPU, 64 GB RAM 3600 MHz, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac27