Focused window bleed onto second monitor

Sorry, but what is Nvidia Control Panel?

I have the problem too.

I find if I dock a window to the left half or right half of the screen it does not bleed to screen above, only when I maximise the window in a screen. 

I have also found in Word, if I have a document open maximised in the bottom screen, and I open another instance of Word by clicking on another Word document in file manager, the first instance of Word gets moved to the top screen.  This is annoying as it opens at the same window size, and my top screen is 1080 but the bottom screen is 4k.  I therefore see the bottom part of the initial Word document now moved on my top screen and can no longer access the title bar to move it!!!

Microsoft - can you please fix this.  It is really annoying having open windows moved to a place I cannot move them from.  It is annoying have maximised windows bleeding into other windows.

Hello SaifNavid,

I am not sure if you ever found a resolve to this issue nor do I know what kind of graphics card you have. I recently upgraded from Win 7 to Win 10 & discovered the same bleed issue. I have two Nvidia Driver based graphics cards & in order to resolve this bleed issue I used the Nvidia Control Panel. On the right side you will see a set of three "Tasks" (3D Settings, Display & Video), select the "Display" task & then select the "Adjust Desktop size & position". Once selected you will see two options, the first selects the monitor  & the second gives you two tabs, one for "Scaling" & another for "Size", select the "Size" tab & option #2 "Resize the desktop...", click on the box "Enable desktop resizing" & then select the command box labeled "resize". Once completed Nvidia will bring a screen with four arrows in each corner & a pop-up box with two slider bars (do not attempt to use the "+" or "-" icon as nothing will happen as this uses a slider type mechanism). Once there use the slider to adjust the screen size & you should be able to solve in the issue.

Unfortunately this is neither a Windows 10 or a graphics card issue, this is simply an issue with the display's resolution not matching the recommended or other preset sizes.

I hope this helps you & all the others.

Thank you for that, it "sort of" solves the problem, BUT using nvidia control panel puts my 3 monitors side by side in the picture which means I have to move my mouse from left to right to switch to each monitor, using nvidia control panel to move them around, instantly recreates the problem for me as soon as I position a monitor on top of the main display. (Bleeding from middle monitor to top monitor.).. (it only does it using Thunderbird, no other program)

Lending support to the idea that this is a bug with Windows.

Here's my setup:

The bleeding happens from the top of monitor 2 onto monitor 3, but not in the way I think any one of us would expect.

All monitors are running their respective recommended resolutions, with no scaling applied anywhere. All three monitors are running off the same GPU.

This is maximizing a window on monitor 2 and having artifacts of it bleeding on to the bottom of monitor 3.

Firstly, it is not just the top-most pixels bleeding over to the other monitor:

Here, you can see that it's the LOWER part of the tab in Firefox that bleeds over by looking at the Blue and Yellow colors of the squares, or the bottom of the Google or Firefox logos. This would seem to indicate that this is not an over-scan issue, or other display-related issue, because a select strip, partially down the screen on the 2nd monitor is duplicated up to the 3rd monitor.

Secondly, it depends on HOW the window was maximized.

This is the result of "bumping" the border between the monitors at roughly the center of the lower monitor:

This is the result of "bumping" the border between the monitors, on the left 25% mark:

You can see how the artifact that's generated along the bottom of the 3rd monitor can be controlled based on where I drag the window from (vertically) and where I bump it on the screen horizontally. Note the subtle differences between the height of the blue and yellow squares and how much text you can start to see in the three examples above. Note the difference in horizontal position of the highlighted browser tab in the lower two examples.

What seems to be happening is that, after "bumping" the top of the screen, it generates an artifact related to what was on the 3rd monitor when the maximize happened.

Finally,

If I hit "Maximize" on the window instead of using the "bump" gesture, I get a white line across the bottom of the 3rd monitor. Which seems to be the same kind of white bar that the OP shows along the vertical border between their monitors.

This seems to indicate that, during the maximization process, the code that handles the maximization of the window neglects to properly clean up portions of the window that were off-screen during the maximization process, for whichever screen a window is being maximized on.

Since I can control what the bleeding looks like, I do not believe this is in any way related to an issue with the displays themselves.

This issue is still present as of Insider Build 21390.co_release.210521-1658
I've been dealing with my lower monitor having title bar bleed to the top monitor on maximized programs for ages, to the point that I moved the taskbar to the top of the upper monitor to stop having to deal with taskbar icons being obfuscated. The following screenshot will illustrate how window title bars from the lower (1920x1080) monitor bleed onto the bottom of monitor 2 (2560x1080). Windows notifications also pop up on the lower monitor's upper-right side, then animate up to the upper monitor. Edit to add: This only impacts maximized windows. Windows in fullscreen (games, videos, etc) do not bleed over for me.