How to screen record on windows device's via WIN/XBOX Game bar
Windows key + Alt + R to start recording - 
press stop button to finish recording this will present a pop up - 
click on this this will bring up the xbox game bar and this should be in the middle - 
If not click on see my captures- 
if no recordings showing follow these steps below -
click on file icon while in the xbox game bar - 
and it will pop up with a message click continue and it will bring you to this page -