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Searches that you have recently made are listed displayed in the Recent list of the search bar dropdown.

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If you no longer want to see a particular recent search you have recently made, you can delete it from the Recent list.

To delete a recent search: 

1. At the top of the screen, click inside the search bar. 
   The search bar dropdown appears.
2. In the Recent list, click the x X next to the recent search you want to delete. 
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1. The search is deleted from the list.