If your console is running version 1.9.5 or higher, please see this wiki article: Eos Configuration of External Monitors
To configure external monitors on an Eos console running a version before v1.9.5:
Hot swapping (unplugging/replugging while the console is on) is not recommended. The preferred method of connecting and disconnecting monitors is:
Power down Eos
Disconnect / reconnect monitors
Power up Eos
Arrange monitors via the External Monitor Arrangement tool.
If you do experience difficulty in arranging monitors, consider upgrading the console's software if possible. The external monitor arrangement tool changed in version 1.9.5 and higher, and this may resolve the configuration issues. Please see this wiki article for more information on updating software: Update Eos Family Software