You can set this property by using the form's property sheet, a macro, or Visual Basic.
You can set this property only in Design view.
Remarks
Depending on the size and placement of the application window, forms can appear off to one side of the application window, hiding part of the form. Centering the form automatically when it's opened makes it easier to view and use.
If you make any changes in Design view to a form whose AutoResize property is set to No and whose AutoCenter property is set to Yes, switch to Form view before saving the form. If you don't, Microsoft Access clips the form on the right and bottom edges the next time you open the form.
