Access Report Sorting & Grouping box

I want the box empty, because I am setting OrderBy with VBA, following instructions the user gives in the form which starts the report. Somehow something has got into the box, and this upsets my sorts. I can change what’s there, but I think I really need to clear the box out to allow programmatic ordering. There are no sorts in the underlying query, but there were earlier, and that may be where the Sorting & Grouping box got values from.