ACAD not letting me set limits, something about "paper margins or background"

I've never had a problem using the LIMITS command before, but in recent files when I try to do it, after I set the origin and the limits, I get the message "Cannot set paper space limits when paper margins or background are displayed."

I've never heard of controlling the display of paper margins or background, so I don't have the faintest idea how to control that.  Does anyone else?

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