To find out how to delete search history on Facebook app, you are expected to follow and apply the steps. Then, to delete search history on Facebook app, you must open the Facebook app on your iPhone or Android device. Now, you are expected to tap the search icon which is located at the top right of the screen. After that, you must move next to where it says recent searches and then you should tap on edit button. Now, you should move to the top of your activity log and then tap on clear searches. Once you do follow and apply the steps, you will be able to resolve and troubleshoot the problems without any fuss.