Filtering Data Source Columns

You can limit the data source columns that are being displayed by doing one of the following:

Entering the title of a particular column into the Filter by Title box.
Entering one or more characters into the Filter by Title box and the suggested list of columns that matched the entries will be displayed.
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.