The Find Sources tool is a field on the Search screen that lets you easily find specific sources by typing a few letters or terms contained within the source.
Using the Find Sources tool to filter sources:
Begin typing the letters or terms associated with the source or sources you want to find.
Checkpoint filters the sources based on what you type, eliminating sources that do not match.
Note: All previously selected sources remain visible on the Search screen, regardless of the letters or terms you enter in the Find Sources field.
For a complete discussion of source selection, see Understanding the Source Selection Screen.