What term is used for soft furnishings on stage like a tablecloth or pre-set props?

The correct term for soft furnishings on stage, such as a tablecloth or pre-set props, is "set dressing." Set dressing refers to the decorative elements used to enhance the scene and create an immersive environment for the audience. These elements are not directly part of the action of the play but contribute significantly to the overall aesthetic and mood of the production.

In contrast, a "set prop" typically refers to items that actors interact with during the performance, such as chairs or hand-held objects, which have a more functional role in the narrative. A "ground plan" is a technical drawing that illustrates the layout of the set and where props and actors will be placed, serving as a blueprint for the production team. "Key" is a term that can refer to various concepts within drama and theater but does not specifically relate to soft furnishings or stage dressing. Thus, "set dressing" effectively encompasses all decorative stage elements that add to the visual storytelling of a performance.