Daily has introduced new properties and instance methods to its prebuilt UI, which allows developers to customize video calls without sacrificing too much time. The new properties include `showLocalVideo` and `showParticipantsBar`, which can be set individually or together depending on the use case. Additionally, two new sets of instance methods have been added: `setShowLocalVideo` and `setShowParticipantsBar`, which allow developers to dynamically toggle the display of these UI elements. These new features aim to help customers and Daily's own team quickly build a webinar app with a customizable video call experience.