To keep the options etc. I use the file "winscp372.ini".
The interface is Explorer. In the file I have started the session with "WindowParams=303;1;1022;260;0" . If I close the session without changing the windowsize "WindowParams=303;1;1022;360;0" is stored in the file and the next session starts with an enlarged vertical windowsize. (This happened with the last older Versions, too)