The Windows->Reset Frame menu item resets the FS/2 window to the 'optimum' size and position for the screen size. It does not reset the internal windows.
Mouse user tip: Push the Data Panel Size pushbutton to achieve the same result as the keyboard 'W' in all window sizing commands. For example, holding down the Ctrl+Shift keys and pushing Size will invoke the same command as a keyboard Ctrl+Shift+W.
Accelerator Keys - Ctrl Shift W