This article explains how to clear your Reddit search history on your desktop and mobile device.
How to delete search history on Reddit app
When you use the Reddit website, your search history is stored in your web browser, not by the website itself. The main Reddit website stores your search history in your browser's cache, and anything you search on the old Reddit website is stored in your web browser's autofill history. To delete your entire Reddit search history, you need to clear or delete cached and autofill data in your web browser settings. This action will delete your Reddit search history, as well as any autofill data you've entered on other websites.
If you don’t want to delete your entire search history, you can also delete individual search terms. When you click a search field on either version of the Reddit website, you’ll see a list of old searches. Clicking the X or trash icon next to a search term will remove it from your browser’s cache or autofill history.
To delete individual search terms from your Reddit search history: