Quicken will extend to both screens in my dual monitor.

Question

I've used Quicken in dual monitor for many years. I have the excel family budget (that the entire family has access to) on one screen and Quicken (the budget execution) on the other. When I received the latest update: Year 2020 R25.21 Build 27.1.125.1, when I click in any other program (like coloring the excel field as completed [reconciled with the bank], or marking it as entered into Quicken for next month), Quicken extends to fill (and usually extend beyond) the two screens. Most times it leaves the top visible so I can drag the entire window to one side (usually the left so I can access the collapse/make sizable/close window icons). However about 10% of the time it extends above the viewable screen so I must shut it down and reopen.

So far, I've tried: 
 - Shifting screens Quicken is on. (If I put it on the right, it still extends 2 screens worth, but now I have to drag both screens from the right all the way to the left to do the repair I mentioned before). 
 - Rebooting  the computer. 
 - Updating windows: Windows 10 Home, Version 1909, OS Build 18363.720 (Set to auto update)

Is there a fix to keep it on one screen only? 
 Thank you!!!!

Chris_QPW · Accepted Answer

Some display drivers let you treat two displays as one big display.  Are you doing that?
If so that might be the problem.  I have two displays and I run with "Extend these displays" in the Windows Display settings, and have Quicken maximized on the left display and that works well for me.