I would comment out this line until the very last minute. Or you can add a check to whether you run from the IDE or not. You can also try something like

On key label Alt-F12 _screen.left=0

>Hi All
>
>In one of my inherited applications, the original programmer 'his' the main VFP screen with
>_SCREEN.LEFT = -10000
>
>If, for any reason, I have to bomb out (or get bombed out) while testing this app the only way I can see my VFP desktop is to always have it maximized. Is there any way I can fix this?
>
>Thanks all
>
>D