An application development component of a development computing system runs a software application developed with the application development component in a pre-build preview state. A broadcast feature editing component of the development computing system changes a state of a pre-production preview version of a broadcast feature associated with a broadcasting service configured to broadcast graphical content output by a post-build version of the software application. An event synchronization component of the development computing system detects the changed state of the broadcast feature and, based on the changed state, alters the running of the software application in the pre-build preview state.