After searching, there are different ways to clear the search results, whether you used QuickFind or Advanced Find.
By default, clearing the search results displays the first page of available items in the catalog, gallery or folder that is currently selected in the Organizers panel.
To clear QuickFind results from the main window:
Select a different organizer in the Organizers panel.
Click Clear Results in the right end of the QuickFind field.
To clear Advanced Find results from the main window:
Click Reset Search at the bottom of the Advanced Find panel.