Found this by typing Form Size into the help screen of Access
Set the size and position of a form or report
Set the default size of a form or report
Open a form in Form view or a report in Print Preview.
Size the form or report by dragging the borders of the window.
Click Save on the toolbar.
Note If the AutoResize property is set to Yes, Microsoft Access automatically sizes the form or report to display complete records. To set the form or report window to the size you want, make sure the AutoResize property is set to No. The AutoResize property for a report is not available in Microsoft Access 2000 or earlier.