This ussually happens when you open another form or report and Maximize it. Then when you close the form/report the previous screen is also maximized.
I usually use Macros to open my form/reports and in doing so I use the "Restore" action on the tied to the object I am closing.
So the actions might be like this for a "Back" option for a button or in the "Onclose" event for a form/Report.
Simply select the "restore" action and the underlying form will restre to it's set size.
you have to play around with it to get it to work to your needs.
Ziggy