If you ever notice Sage is opening mostly offscreen on opening even if you close it while in the correct position you can follow these steps to reset the launch position for Sage:

1. Open Regedit
2. Backup the registry
3. Navigate to HKEY_CURRENT_USER\Software\Peachtree\Version\(version)
4. Delete the “Positions” key
5. Re-test opening Sage 

At this point it should reset and open fullscreen on the main monitor