How to combine all windows from two monitors to one?

Question

System administration

When switching from two monitors to one with the same Windows, some applications that were once dragged to the second monitor still open outside the first screen and you have to use Alt + Space every time and use "Move" to pull the window to the first monitor .
Is there an easier way to solve the problem?
OS Win 8.1

Answer 1

Well, at the same time - I don’t know, but instead of Alt + space and move, use Win + shift + left / right, depending on which monitor was the main one. It's much easier for a single window.

Answer 2

https://www.realtimesoft.com/ultramon/overview/ ?