How do I hide the media player under the slide pane in impress?

Somehow I hit something (maybe on the sidebar) and now a media player has appeared just to the right of the slide pane on LibreOffice Impress on Windows 10. I can’t figure out how to make it go away. It doesn’t appear to be a toolbar that I can toggle on or off in the View → Toolbars menu. I can adjust the size and even hide it under the slide pane, but it pulls out when I try to adjust the size of the slide pane. How can I make it go away? I even completely uninstalled and reinstalled LibreOffice, but even this did not make it go away.

I’ve attached a screen shot.

Many thanks