The Target Core seems to work just fine. I am almost certain that it is the Selection Control plugin itself that is the issue, Target Core on its own seems to work as intended when added to the side view sample project.
Thank you for your response.
Next maybe try switching the battle scene config with the base battle scene config (it should be in the sample folder under Luna Engine Base) and see if the windows are there. If they are there, chances are that Selection Control displaces the windows off screen. If they're not there, then I would do a window search as specified in the manual to see if the plugin made new windows that replaced the existing window that holds the battle statuses.