The search feature was removed within QuickBooks Self-Employed (QBSE) to streamline the interface and improve performance. As a workaround, you can use the Find feature in your browser. To do this, press Ctrl + F or Command + F on your keyboard. Once the search bar appears, enter the customer's name. The browser will highlight it in color so you can spot it on the page.
Please let us know if you have any questions or require further assistance.