The Text Filter is set to filter on a Single Line of Text column. Only list items that meet that filter criteria display in the list.
|1.||When you reach a page that contains the Text Filter web part, you simply enter a text value into the web part text field and click Apply filter to begin filtering. It is that simple!|
|2.||To revert to unfiltered data, click Clear filter.|
Depending on which column your admin set for filtering on data, you should see your list change based on your input.