The WinKey+PrtSc feature to take a literal, full-screen screenshot has been part of Windows 10 since day one. My "problem" (for some value of problem, and definitely small) is that I almost never want a full-screen screenshot but rather one on the window/dialog that has focus only. That was, and still can be, achieved via ALT+PrtSc, but in earlier versions of Windows 10 WinKey+ALT+PrtSc did not do the corresponding thing; in fact, it did nothing.
I tested again a bit later this morning on my Win10 Pro 32-bit system that's also Version 1803. It behaves in precisely the same way. WinKey+PrtSc does a very brief "screen flash" to let you know the snapshot has been taken and placed in the Pictures\Screenshots folder. WinKey+ALT+PrtSc exhibits a slight delay with nothing seeming to happen, then a notification sliding out from the bottom right from Xbox Gaming Overlay saying the capture is in Videos\Captures and, surely enough, a .png file of the window/dialog that had focus is there.
What I don't get is why they don't both end up in Pictures\Screenshots, but I'm still glad to be able to take a windowed screenshot and not having to involve Paint (I never use Paint3D, even on Win10).
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134
. . . the presumption of innocence, while essential in the legal realm, does not mean the elimination of common sense outside it. The willing suspension of disbelief has its limits, or should.
~ Ruth Marcus, November 10, 2017, in Washington Post article, Bannon is right: It’s no coincidence The Post broke the Moore story