Can't get rid of a LR "extra panel"

[BrianWoolf]

Running Mac OS 10.7.5 and LR 5.7.1 - have an iMac and an NEC as a second but main screen for LR work, better color correction.
by an accidental key press I activated a LR panel that takes up my whole second screen, my iMac and I can't figure how to get rid of it (I don't need it) or what the panel might be called. Looked in the Library Module Shortcuts and found no help there. The Panel has at the top "Grid| Loupe | Compare | Survey | Slideshow" choices. I have no idea what this panel might be called so I can't look it up anywhere and i don't want to randomly keypress everything, figure it would just make things worse.
Thank you,
Brian

[owinthomas]

Try this https://helpx.adobe.com/lightroom/help/displaying-library-second-monitor.html

[BrianWoolf]

Thanks, Owinthomas, that did the trick, never thought to look in the filmstrip section.
Brian