Click View > check the box for Graphic Library.
...
Graphic Library provides prebuilt images organized by category, allowing you to design attractive graphic pages quickly and easily.
Numerous images, such as valves, water tanks, pipes, gauges, lamps, and other industrial objects, are included. You can also add custom images and objects to the library.
...
The contents can be expanded
...
by clicking Expand All icon at the top left of the window. Also, the contents can be collapsed
...
by clicking Collapse All icon at the top left of the window.
...