Everything search can search file contents, but unlike Windows Search the Everything does not index file contents, so searching on file content alone, unless you also combine it with a suspected file name/wildcard, will be painfully slow compared to a straight Everything search.  See:  https://voidtools.com/faq/#does_everything_search_file_contents

Sharon, hit the WinKey then enter "Cortana" sans quotation marks.  You should get the "Cortana & Search" settings returned, probably as the first item.  Once you've gained focus on that then hit enter to open it.   In Version 1607 there is a toggle (checkbox) for "Search Online & include web results" which you will want to toggle off if you wish to avoid having web results in your Windows Cortana searches.

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Brian

        Presenting the willfully ignorant with facts is the very definition of casting pearls before swine.