I'm suddenly getting a screen with Lightroom CC. I don't recognize it, and I don't know how to control it. Perhaps if I knew what to call it, I could figure out how to get rid of it. Please help. Here is a photo of the screen:
This doesn't look like Lightroom Classic. Please state clearly the name and version NUMBER of your software (and do not use words like "up-to-date" or "current").
This looks like a secondary display window.
If you press F11, it will appear, even if you only have one monitor, as far as I can tell.
Press F11 to close it, or go to Window > Secondary display > Show
The survey view lets you see multiple images side-by-side so that you can choose the one you need.
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Per Berntsen is correct- it is the 'Secondary Display'- F11 to toggle on/off. Or click on the  screen icon on the Tool bar.
ManiacJoe suggests you have 'Survey View' selected on the Menu, but you would need two or more photos selected (from Grid view) to see more than one photo in Survey mode.
I am curious why LRWizard sees [Slideshow] on the Second window- I do not see [Slideshow]!