You must hit Windows Key+Prt Sc to have a full screen screen shot automatically saved in the Pictures\Screenshots folder in PNG format.
Hitting PrtSc alone places a full screen screen shot on the clipboard, but if you want to have it saved you need to open an image manipulation program such as Paint, paste it, then save it.
Brian - Windows 10 Home, 64-Bit, Version 1803, Build 17134
Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts. Broad, wholesome, charitable views of men and things cannot be acquired by vegetating in one little corner of the earth all one's lifetime.
~ Mark Twain