Move off-screen window back to screen on Windows 10 [duplicate]
Solution 1:
Sometimes it is impossible to right click the runaway window so none of the other solutions here work. The only foolproof method that I found ALWAYS helps is to find the process in task manager, click on the arrow to expand the application dropdown, then right-click the process and select "maximize window".
Solution 2:
First activate the window by clicking on it on the taskbar and then press the Windows logo key on your keyboard together with the left or right arrow key.
If the window was minimized, you have to press Windows logo + arrow up key.