This post is part three of a three-part series on how to build an Electron call overlay app using daily-js. The tutorial continues from parts one and two, which created a full screen Electron app with Daily's call object. The new feature adds the ability for users to drag participant tiles and call controls wherever they want on the screen, making it convenient for them to interact with background applications. To implement this, a JavaScript module called drag.js is used, which provides a setupDraggableElement function that sets up event listeners for drag operations on elements. The tutorial covers how to handle the "dragstart", "allowDrop", and "drop" events to make participant tiles draggable. Once implemented, users can experiment with various features such as limiting the number of participants, showing the currently speaking user, and adding screen sharing support. The tutorial concludes by suggesting reviewing error handling and adding proper logging and metrics for production deployment.