#StackBounty: #windows-10 #display #scaling Windows 10: Application windows are scaled down

Bounty: 50

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 1920×1080 PNG picture in Paint and maximize it on the middle monitor (that has native 1920×1080 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 1920×1080 with 150% scaling and the third monitor is 3440×1440 at 100% scaling.

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

Screenshots:

MS Paint showing own screenshot sized 1920×1080 but scaled down:

MS Paint showing own screenshot sized 1920x1080 but scaled down

TeamViewer showing a 1920×1080 remote screen, yet smaller that local 1920×1080 monitor, even if set to 1:1 scaling:
TeamViewer showing a 1920x1080 remote screen, yet smaller that local 1920x1080 monitor, even if set to 1:1 scaling


Get this bounty!!!

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