Your searches are saved in the ThrillPiXx app to help you easily find accounts and hashtags you've already searched for. However, you can clear your search history to "refresh" the list of what you've searched for. Clearing the search history deletes any terms you've already searched for.
To clear your ThrillPiXx history:
Once you've cleared your search history, any terms you've searched for prior to that point are deleted, but any terms you search for after that point are saved.