The flat list pages provide a search bar at the top of the page.
You can use the Search box to perform a quick search. The search filters all values that contain the string entered in the Search field.
Click the button to open the drop-down list that displays the columns available for filtering. Select a column from the list and enter a search string in the Search field. Click Go to apply the filter. If you do not select a column, all columns of the report are searched for a matching value.