Windows 10: my mouse is going to my other monitor while i am in fullscreen on games

ever since an update came out on the 5th im not able to play any games on fullscreen. i uninstalled it and it work after but then some how it resinstalled and now i can delete it anymore i do not want a third party software i just want my pc to work again.

:)

 

Games in Fullscreen don't work on main Monitor

Hey, I have this problem where i cant play my favorite games like CS:GO on my main monitor in FULLSCREEN without the game flickering on launch of just having a black screen. However if i make my second monitor the main display the game works perfectly.
**** is going on

The monitor im having problems with is the BenQ XL2411Z

The second monitor is LG 29UM65

I find this really important because i run CrossFire and i dont get the benefit of extra fps if im not running the game in FULLSCREEN

(ps: the game runs fine in windowed mode but thats not what i want!)

 

"Scroll Inactive Window" does not respect Fullscreen application in multi-monitor config

when "Scroll Inactive Window" (settings > devices > mouse/touchpad > Scroll Inactive Window when I hover over them) is active it performs inconstantly with fullscreen applications, and the way the mouse performs otherwise with an application in Fullscreen
display mode. the feature works fine otherwise, but this side effect makes it frustrating.

for productivity this feels functional, and fluid. this mostly impacts things like games, but it still does not feel intended, or consisted with what Fullscreen is supposed to entail, or what things are actually constrained.

expected: in fullscreen mode the mouse is supposed to be completely constrained to the given screen/monitor, and all interactions of the mouse are expected to only interact with the window the mouse is locked to. for the most part this is why borderless-fullscreen
(or fullscreen borderless windowed mode) was implemented to have a program appear like fullscreen, but allow the mouse to behave like windowed mode.

issue: when running a fullscreen application like a game with "Scroll Inactive Window..." active, and using the mouse in the program, if the mouse would logically leave the fullscreen application "Scroll Inactive Window" will function even though any other
button of the mouse will do nothing, and with the logical position of the mouse being invisible to the user. this occurs with most any fullscreen application, and impacts multi monitor configurations.

example: having a program running in fullscreen mode (most prevalent in games), with a youtube video (could be a text document/webpage), and have the mouse logically leave the fullscreen application (if left monitor is non-primary then run mouse to the left)
then use scroll wheel. this is inconstant as clicks and secondary buttons do not function.

can this feature either respect fullscreen display mode, or maybe have a sub toggle for "use Fullscreen mouse lock"

 

Taskbar will not go away when playing games in Windowed(Fullscreen)

Games work fine in fullscreen, but have the taskbar visible on top of the game window in windowed(fullscreen).

Game max native resolution is 3440x1440 and my monitor is 3840x1600. How do I fix this?