The Schema Viewer is automatically displayed when you open Migrate. Only one Schema Viewer is active at a time. To close the Schema Viewer, double-click its Control-menu button in the upper-left corner.
When you close the Schema Viewer, the table and query specifications it contains are discarded.
To open a new Schema Viewer, select the New command from the File menu. When a new Schema Viewer is opened, Migrate clears the current table and query specifications. If you want to save these specifications, you must do so before opening a new Schema Viewer.