First download the extension IndexedDBEdit:
Link here: IndexedDBEdit
Then go to: Narrow One
Create a new preset
Then press "echap" if you have a windows or "esc" if you have a MacOS.
Select IndexedDBEdit
Click on keys then keys values and scroll down
There is your preset ID
Something write is "peasantBody" or something like that.
Delete ONLY this text and remplace by "narrowOneBirthdayBody" then click on ur page (narrow one) and reload