It would be forms Width property.

>I want to do experiment with duo monitors, thus I need to set the form width to 2048 (2x 1024)
>I do it by dragging the form to double width.
>
>but when I run the app, the form goes back to 1024
>
>which property should I set?
>
>thanks for the help
>
>regards,
>
>Jerry