Dual monitor arrangement

I just upgraded to a new 27' 5K iMac and am still using a 21" cinema graphic apple monitor as a second .  When i adjust the side my side arrangements so my pointer goes across it defaults back.  Have to re-adjust it daily.  This never happened with my old 27" iMac late 2009
Thanks for any ideas

The arrangement shown above has been called "Extended Desktop", and has been the default since 1987, until recently. The Icon size is proportional to the number of pixels in each display. The blue box for each screen can be dragged to the appropriate position (right left up down) relative to the other, as long as they continue to touch somewhere. The menuBar can be dragged to any display.
As you work, the mouse moves freely across the dividing line between displays, and a window can be dragged with it. You can even park a window so that part is on each display, and when you scroll the window it will move "the right way". This works even if one display is Black and White and the other is millions of colors.
Recently, a feature has been added that makes each display independent. It can be turned off in Mission Control.
"Full Screen" is an abomination ported from IOS for iPhone, the land of tiny screens and one-at-a-time processing. It should be avoided on your premium quality multiple screen Mac Pro.

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    Welcome to the Apple Forums.
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    This is driving me nuts and I must be missing something...
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    I've a similar problem. But actually my problem is very common; I've seen a lot of programs showing this.
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