Clear Mailbox Search History

Sorry in advance if this is not the correct location for this question. A User in our Organization is looking to clear the Search History of the Input Search Box at the Top Right corner of the GroupWise Client, where you can search your mailbox for specific messages. I have performed quite a bit of online searching, and have not been able to find an answer. Fellow Analyst mentioned that they reimaged the computer, and it still appears, so I am guessing that it is associated with the user account?

Any advice would be great!

Thank you in advance,