If the Address File - Correspondence screen minimises on starting up, this has been caused by the screen having been minimised and then exited. Maximising the screen and then exiting does not resolve the problem.
The start up settings are stored in the Workstation 'ini' file (in the shared data directory).
Edit the 'ini' file and in the [StartupPositions] segment, remove the entries for 'Setup_Address' entries.
They will recreate themselves when you open up the Correspondence tab.