Modifying Stock Change ST2 object

I am trying to remove some of the columns on the ST2 object which is the stock selection browser on the stock change screen. When I remove the columns from the ST2 object, validate, and validate the entry transaction, the field is still showing on the screen. Can somebody tell me how to modify the columns showing on the ST2 object since it doesnt seem like deleting the field from the object is making it disappear?

We are on v11 patch 4

Thanks,

Chris 

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