Title Field in Item Doc

The title filed is missing in Item Doctype in V13
The system by default is taking naming series as Item code
after saving an item, the list shows both “name” and :item code" as same value…image attached

after saving an item and reopening it, the “item code” is no more visible
Is it a bug
v12 was clean
Please help…

Solved it
the settings has to be changed in the stock settings
Item naming By … Item Code
Admin can close this
Thanks and Regards