

Use the left, right, up or down keys on your keyboard to bring the window back into view.Press Alt + Space + M to change the mouse cursor to the move cursor.Press Alt + Tab to select the missing window.It takes a few seconds but achieves the same goal. If you lose a window, you can trigger the move cursor to bring it back. There is a keyboard shortcut for almost every element of Windows and this is no exception. Using a Keyboard Shortcut to Recover a Window

You could also use stacked or side by side if you prefer. If Windows has detected that the other monitor is not working, the lost window should snap into position on your remaining monitor.Right-click on the Windows 10 Taskbar and select Cascade windows.
