I’m trying to customize Spark client.
To disable “Broadcast” menu item, I set “DISABLE_BROADCAST_MENU_ITEM = true” in default.properties which is located in Spark\lib\spark.jar\org\jivesoftware\resource. After that, users will no longer receive any broadcast messages. In the description of the property said that it only hide the menu item.
Spark 2.8.3 Windows platform