Once a filter is executed, you can search columns. In order to search in columns, you must click the Toggle advanced filters button.
Once advanced filtering is toggled on, you can search columns. To search within a column:
You can remove one or all filter values for a column. Click the x next to the value will remove that value from the result constraints. Click Reset to remove all values for that column.
If you want to see all of the filter values applied across the columns, clicking Close will close the Add filter value field view. The following is example of filter values applied to multiple columns after the Add filter value field view is closed: