How to record entire screen on Windows 10?

Is there a way to record entire screen in Windows 10?

Trying to use the Windows game bar to record (see https://www.laptopmag.com/articles/how-to-video-screen-capture-windows-10), I find that it only records the most recent windows clicked on before hitting the game bar hotkey (perhaps I am using the feature incorrectly).

My actual use case is that I have dual monitors: one large, where I want to record several windows to demonstrate something, and a laptop screen, where I have a script I need to read from (so need to capture audio as well). I then edit these videos in the Photos video editor. I want to record the entire screen of the larger monitor. How can I do this in Windows 10?

The easiest way is to use recordscreen.io

You don't need to install any software, and you can literally learn to use it in just a few seconds or minutes.