The Search tab allows you to search for a text string in file titles, annotations, or leaf titles.
You can use Simple Search or Advanced Search.
You can run a simple search directly from the search toolbar.
Go to the Look For: field and enter a text string.
Click the Find Now icon 
. The simple search will search all files, annotations, and titles by defaults.
Examine the results.
Choose the Locate icon 
to find the section within the Navigation pane where the document resides.