window wrong size in Outlook Express

> In Outlook Express, the main screen and all subsequent
> screens goes to whole screen only, or totally minimized,
> and will not go to the cascaded or partial screen mode.
> This means when I reply, the reply screen is full screen,
> and I cannot see the text I am replying too. Also,
> Outlook Express cannot be set to partial or tiled view, so
> I can still see the Internet Explorer screen.
>
> This only started happening a week ago, seemingly out of
> the blue. I have no idea what I or some other family
> member might have done to change it, nor can I do anything
> that restores it. How can I change the setting to enable
> partial, or tiled screen views?
>
> Thank you, Fred