The Default Data Group for New Reports property specifies which data group is initially selected in Step 1 of the report wizards when the user creates a new report. If this setting is "" (the default value), the "All" data group is selected. To change this setting, select the desired data group from the drop-down list.

This setting may appear with a different name (such as "Default Module for New Reports") if you've changed the Description for Data Groups setting.