The "Find what" box has a dropdown arrow at the right hand side. Previous
searches should be remembered and presented in the list if you click the
arrow.
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Enjoy,
Tony
www.WordArticles.com
If you don't close the Find panel before you open the next document,
the search item shouldn't change. And it seems that if it found the
item at least once in the first document, the item is retained until
you change it and you can click the double-arrows below the vertical
scroll bar in your other document(s).