By default, when launched, the Rumba Mainframe Display view connects automatically to the enterprise server associated with your project.
You need to connect Rumba Desktop or any third-party emulator manually to the enterprise server associated with your project.
When using the embedded Rumba Mainframe Display view, you can have more than one active connections at the same time, but the display is only showing one of them. To switch to a different connection:
This connects the display to the respective server and loads the application in it.
Closing the Rumba Mainframe Display view does not disconnect the active sessions.