If you want to reset the relational view of your schema map, you can do so by restarting the wizard. Restarting the wizard overwrites your existing relational view, including customizations, and allows you to reselect the initial relational view of your data.
Note that restarting the wizard only resets how native objects map to the relational view. Therefore, after restarting, your schema map will continue to use the existing file name and connection settings, including security and configuration option settings.
To restart the wizard, click the restart button
or select File>Restart the Wizard from the Table Wizard window. Then follow the instructions in Creating a Schema with the Table Wizard to create a new relational view of your data.