Windows 10: How to focus to splited screens when moving mouse cursor to spliited screen

I have an two excel sheets opened in two splitted screens. I have open those excel sheets for comparing the values of total in both sheets. After verifying the visible cells in the screen i have to scroll to the down of the page in both excel sheets. Currently the mouse and screen if focused in the splitted screen named as SPLITTED SCREEEN ONE and i have tried to scroll to the bottom of the page. The same way i would like to scroll in the next splitted screen named as SPLITTED SCREEEN TWO. I am scrolling in the SPLITTED SCREEEN TWO also but i want to click on the SPLITTED SCREEEN TWO to scoll

:)

 

Mouse Cursor moving to centre of screen

Every ten seconds my mouse cursor moves to the centre of the screen. I have 3 monitors normally, and also a 4th hdmi cable into my AVR which duplicates one screen. The problem only happens when the AVR is turned off. It never used to happen though.

 

Black Screen with working mouse cursor but not keyboard

It is frozen or just black screen in Safe mode ?
might try to repair Windows by an installation DVD or a USB stick

 

How to prevent the mouse cursor from moving up/down when scrolling on touchpad

Thanks for your reply.

Yes. There are a number of different cases. Take UWP application "Microsoft News" and traditional windows application Chrome browser as an example:

• If "Microsoft News" is of the focus, and if the mouse cursor is within "Microsoft News", when I scroll down using two fingers on touchpad, the mouse cursor first disappears and reappears to the bottom of the original position as a small dot, which also
  moves down on screen. After I stop scrolling, the small dot disappears, and the mouse cursor does not reappear, until I move the mouse on touchpad with a single finger.
• If "Microsoft News" is of the focus, but if the mouse cursor is within "Chrome" browser, when I scroll down using two fingers, "Chrome" browser becomes the focus (which should not have happened), and the mouse cursor completely disappears. It won't reappear
  immediately after I stop scrolling and move the mouse with a single finger, but reappear in one or two seconds from the neighborhood of where I would expect it to be. So in this case: 1. I won't expect "Chrome" becomes the focus but it will; and 2. I cannot
  predict precisely where the mouse cursor will reappear on the screen.
• If "Chrome" is of the focus, but if the mouse cursor is within "Microsoft News", the "Microsoft News" becomes the focus, which shouldn't have happened either. Then the mouse cursor becomes a small dot, which is the same as the first case.
• If "Chrome" is of the focus, and if the mouse cursor is within "Chrome" window, nothing suspicious happens.
• For the above four cases, if I scroll using a physical mouse rather than a touchpad, nothing suspicious happens.

This issue takes place every time when a UWP application and a traditional window application are both visible on screen.

More issues:

• When two UWP applications are both visible, if one scrolls (not tested with a mouse yet, only on touchpad) over the app not in focus, it becomes the focus, which shouldn't have happened.
• When two traditional windows applications are both visible, if one scrolls (not tested with a mouse yet, only on touchpad) over the application not in focus, the scrolling speed becomes
  very fast, even if the speed has been set to slow in the touchpad setting panel.

Probably there's no way but waiting for update. But if there's anything I can do to fix them, it would be of great help. Thanks again.

P.S. I'm using Samsung laptop preinstalled with Windows 10 Home edition. I never turn off Windows update.