The good news is that one can change the default settings of Windows Update by editing registry.
Besides that, all the Windows Update setting offered in Group Policy are available in Registry as well.
Enter the name as Windows Update (no space between Windows and Update).
Note that even after creating the New Key, you can right-click on it, and then click Rename to rename it as Windows Update.
I don't really know what just Change by itself means or does.
Repair should definitely restore Registry value that was set during the original installation.
If you navigate to Advanced options of Windows Settings in Settings app, you will see Never check for updates as the status under Choose how updates are installed section.