The one on the case and the one in Windows, both do the same

How come my shutdown button is not doing it though?

Excellent....that did indeed make it log off properly!!
Can you let me know what the switches are for please?

At work now so I'll wait til my break and try it ta. Can you explain what each thing does please?

When I press the power key, or when I click on power>shut down, Windows 10 reboots instead every time. Is this a known fault and if so is there an easy fix for it?