They can change it to whatever as long as it's fully consistent and doesn't have menus from Windows 95. At this point I don't even know if it's possible.
Frankly, I’d argue that changing most settings is easier in windows 95.
It wasn’t perfect but it was a solid UX base with a lot of logical concepts to evolve from.
Keyboard navigation of menus does not have that problem.
In Windows Vista/7/later versions of 10 the solution Microsoft used was to make the tree clickable like the tree in Explorer.
In 8/early 10/11 the solution used is to forbid nesting.