After upgrading from Windows 7 to 10, my PC immediately had problems (bluescreen after a minute after login, each time).
The "Go back" option in the Settings would not work (or even be present sometimes, I tried safe mode).
I discovered, that the
Go back to the previous build in the boot menu does the same thing (except that it actually works). It is described in some articles, like this one: How to Go Back to the Previous Windows from Windows 10
In the boot menu select Troubleshoot / Advanced options / Go back to the previous build.
(see here about how to get to the boot menu if you're not seeing it)