Click “Add decoration”: a browser opens with global catalog objects and ones you created with an image and default measurements. Private “My objects” live under /you/decos—upload PNG/JPG with a consistent background so they sit cleanly on the wall.
Resize a deco with canvas handles or by typing width and height in centimetres in the info panel; stay inside the wall bounds so nothing clips in the public thumbnail.
Mix pedestals, plants, or light architecture with your artworks for scene context without stealing focus from the pieces.
Wireframe: deco icons on the canvas and a dimensions panel.