If a field of GridForm is not going to be needed any more, delete it. To delete a field, first open DataForm.NET Manager. Choose a dataform in DataForm List, the fields of that GridForm will be displayed in GridForm tab. Click "Delete" icon to remove field from GridForm. The distinction between "In use" and "Delete" is that if a field's "In use" property is not checked, it is disabled but its properties are still in GridForm, it can be enabled later. However, a field is deleted, then all of its properties are gone.