1. Enable the toggle “Show secondary Display” in the toolbar.

  2. Check if the secondary display is hidden by another program.

  3. Use the shortcut Ctrl-Left and Ctrl-Right to move the secondary display from physical screen to another. Secondary Display is agnostic of the workspace setup and is sometime mapped in a non-existent screen.

  4. If alll those step does not bring back the Secondary Display, close and re-open RealMotion.