Filtering Data Source Columns
You can limit the data source columns that are being displayed by doing one of the following:
q Entering the title of a particular column into the Filter by Title box.
q Entering one or more characters into the Filter by Title box and the suggested list of columns that matched the entries will be displayed.
q Clicking the All Types drop-down list and checking the box of the data column type.
The data columns that matched the selected type are displayed.