The Library window
The Library is a window of things to put into a drawing: 2D symbols, 3D objects, materials and the components already in your model.
Click the Library pill at the top left of the canvas. The window opens on the 3D tab. Its tabs are 2D, 3D, Materials and Components, and a Generate a model button sits to the right of them.
On 3D, a rail on the left filters by All, Furniture, Appliance, Kitchen, Bathroom, Outdoor and Nature. Search matches an object's name, tags and aliases, and the rail's counts show matches per category. Materials has its own rail of material categories with counts and a search box. Components lists what your drawing already contains.
Making a model from a description or a photograph is covered in Generating a 3D model.