ottermouse,
Have you tried using the Snipping Tool?
Use Snipping Tool to capture screenshots

Others have suggested the Snipping Tool, but that's just an editor.  

I have a Dell Inspiron 15, only 14 months old  now in Sept 2020.  The print screen feature worked fine until a few weeks ago, when suddenly only the Snipping Tool appeared when I pressed PrtScreen.

This is very annoying.  I need to take screenshots for my Online course and so do my students in the class.    Why did the Print Screen function suddenly change like that?

Another cause is Chrome Incognito Mode, which doesn't allow screenshots. The problem could also be due to a mechanical issue, such as a broken button, or low storage availability

That has also happened with my Dell Latitude, it was working fine until recently

this hasnt been answered yet?  i bought a dell lat, and after a whiile my beloved screenshot stopped working too. I dont want to have the screen and snip tool always running and slowing down my computer

This option is for gamers who want to take a screenshot on a Windows laptop.
While playing the game, press the two keys: Windows and G, together for a game overlay.
Click on the camera icon or press Windows key + Alt + PrtScn keys to take a screenshot.

Regards,
Jimmy