Windows 10: Application windows are scaled down on a 100% scaled monitor

Many applications windows are scaled down to about two thirds of original size on my system (a laptop with two external monitors) and also on one another (also a laptop, but with a single external monitor).

For example, if I open a 1920x1080 PNG picture in Paint and maximize it on the middle monitor (that has native 1920x1080 resolution and is set to that resolution in Windows, with 100% scaling), the picture will not take up the entire window, but seems to be scaled down to about 66%.

What could be the cause and how to fix it?

It is Windows 10 Home 64 bit (up to date, version 1803).

The laptop monitor is 1920x1080 with 150% scaling and the third monitor is 3440x1440 at 100% scaling.

Logging out and back in does not help, neither does rebooting.

Screenshots:

MS Paint showing own screenshot sized 1920x1080 but scaled down:




TeamViewer showing a 1920x1080 remote screen, yet smaller that local 1920x1080 monitor, even if set to 1:1 scaling:



:)

 

scales & applications

Hello,

Thank you for reaching out to us. Windows 10 may have encountered a display setting issue that caused this on your applications. For us to assist you better, kindly answer the following questions:

• Have you made any recent changes prior to this issue?
• What is the current build and version of your Windows 10? To check type in
  winver on the search bar and press Enter.
• Have you used an external monitor previously?

Meanwhile, we suggest that you check this article and perform the troubleshooting steps given to see if there will be any changes:

Windows scaling issues for high-DPI devices.

We'll be waiting for your reply.

If you think this was useful, kindly mark it as answer to help fellow community members who are also experiencing the same issue.

 

scales & applications

Hello,

I followed the instructions in the article, and the problem was fixed.

Thank you very much for your support!

 

Mixed resolution scaling results in blurry applications?

This looks to be a continuation of the bug described here: Multiple Display Scaling is Blurry.

I have the following monitor configuration:



Monitor #1 is UHD and is using 150% scaling. Everything that respects scaling looks great on that monitor. Monitors #2,#3,#4 are 1080p, 1080p and 1440p respectively, and are set to 100% scaling. The problem is that most things appear obviously blurry
on monitors #2,#3, and #4. Windows appears to be scaling everything on those monitors to 150%, then scaling back down to 100%. Any legacy dialogs and applications that don't respect scaling look perfect on monitors #2, #3 and #4.

If I take an application that does respect scaling (say Chrome or Edge), and place it on monitor #1, but overlap it a little bit onto the other monitors, the application looks scaled to 150% on those other monitors and does not appear blurry.



After fiddling around with connections, I'm convinced that it is not a hardware or driver issue, and that Windows is scaling, then descaling, the monitors I set to 100%, and the results are very poor. Is there any way to get Windows to simply *not* scale at
all on those monitors - to disable it entirely?