Without clarity on the difference, it’s easy to confuse the Knowledge Graph and the right-hand side panel display on your screen. The Knowledge Graph is the engine that populates content into the panel that’s technically called the Knowledge Graph Card. Displayed is the card is the more visible results of what the graph generates. When a topic has sufficient data, the card will consist of a variety of information such as relevant facts, images, reviews, a Wikipedia description, social profile links, related queries, and ratings. Recently, more details on local business orders and appointments have been noticed in the Knowledge panels in the United States. I noticed a client who had 2 separate knowledge panels, one for their personal site and one for their Google Business Listing; others have reported it when their business has more than one location. Some show reviews in the middle of the Google knowledge panel, other's products available, and still others had an appointment booking app that turned up in the center of their knowledge panel. While adding structured data for orders and appointments may not improve page rankings, they will likely engage more customers for the business.