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I understand that you want certain columns not to show at all on the canvas when a certain user opens the form. Then, in the when-new-form-instance trigger, you should set_item_property(x_item, visible, property_false) for each item you do not want to be dislayed, depending on the user.
Set the Item values to NULL in a POST-QUERY trigger. But be careful if the end-user commits, he/she will store the null values in the database !