Adobe ACROBAT READER 7.0 Manual page 220

Closing the Search PDF window
There are several methods of closing the Search PDF window:
(Windows Only) Click Hide at the top of the Search PDF window. The document pane
returns to its larger size. If you accidentally close the Search PDF window, simply reopen
it to view your most recent search results.
If a How To page was open before you started searching, click the Back button until
that page reappears.
Click Done at the bottom of the Search PDF window. The How To window returns to its
state before you clicked Search.
If you accidentally close the Search PDF window while reviewing the results of a
search, you can click the Search button to display the results. You can also choose
Edit > Search Results > Next Result or Edit > Search Results > Previous Result. The most
recent search results remain until you do another search or close Adobe Reader.