The Rename remains on the main context menu, but it has been moved to the top/bottom zone of the menu, and no longer displays text (just a pictogram) unless you hover the mouse over it.
The icon should look like a rectangle with an I-Bar cursor inside.
Ironically, the "Undo Rename" context menu entry which appears after you have renamed an item appears as a standard context menu entry with a small icon and text.
If you do just wish to revert the context menu to the win10 version, there are a number of options involving either registry changes, or tweak applications as @moab indicated.