The administration interface includes a Sites and Lists tab that is used to select the sites, portals, and/or sub-areas and lists to include in the user presentation of the SharePoint Data Provider. You can select any number of lists or libraries from any number of sites on the server that the web part is running on as the source for the SharePoint Data Provider.
NOTE: When you are finished making your selections on this tab, make sure you click Apply to save your changes and keep the administration interface open, or click OK to save your changes and return to the SharePoint Data Provider display. Other tabs do not require you to click Apply to save changes; changes are saved automatically when you move from one tab to another. However, this tab differs in that clicking Apply loads your schema selections and other settings referenced by other tabs.