DATASHEET --- Allow Design Changes: Design View Only DOES NOT WORK

I have a sub form in DataSheet view and I would like to lock the design so that the User should not change the layout

Even when I set the property of the Datasheet “Allow Design Changes: Design View Only” users are able to unhide the hidden columns and they can also change the size of the column by dragging the column end line



Does any one know how to lock the design of datasheet ( I am using this sub form datasheet for data entry but do not want users to change the layout)



Thanks
Rahul