Movie Form Design: Combo Box Key Decision 6. Try it: Unhide the Key Column Uncheck the option: Hide key column.   What Do You See? This Combo has two columns: RatingID and Rating.   Click Next.   Memo to Self: This option lets you choose which Field should be stored.   If the key column is hidden, the Combo Box Wizard will select the Primary Key, RatingID, by default. Exam 77-424: Microsoft Access 2013 4.0 Create Forms 4.2 Set Form Controls: Add Form Controls (Combo Box Wizard) Form Design Tools->Design->Controls