Prevent Windows from moving applications

Running Windows 10 with two screens.  One is usually off and tucked away and I work on the other.  I've usually got a number of applications open at any one time eg, mail, browser, music player, file manager.

These overlap on the open screen but that isn't a problem.  I can access/switch to them through the Task Manger bar.

However if I open a particular game "Return to Castle Wolfenstein" and close it any application that RTCW overlaid has been pushed onto the second screen, the one that is off.

Much nattering and cursing then occurs as I have to open the second window up and drag the offending applications back to where they belong.

So the question is:  How do I stop Windows relocating my applications to the other window?
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dbruntonQuid, Me Anxius Sum? Illegitimi non carborundum.Asked:
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David Johnson, CD, MVPOwnerCommented:
use windows key + P to set your system to single monitor mode when you have the other monitor turned off

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dbruntonQuid, Me Anxius Sum?  Illegitimi non carborundum.Author Commented:
Experimentation underway.
dbruntonQuid, Me Anxius Sum?  Illegitimi non carborundum.Author Commented:
That's it.

Windows key + P and select PC screen only restores.
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Windows 10

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