If you want to know about how to clear search history on Facebook then click on view your activity log button from the profile page. You will find the button on the right hand side. In the left menu, under photos and videos click more. When the menu expands to show all filters then choose to search history. You will see a full chronological list that you search for on Facebook. You can smoothly delete individual searches by tapping on edit button next to entry and choose delete option. Lastly, you can wipe the entire search history in one go by tapping on clear searches button.