Layout "cleanup" undoes all my work

hello,

i have started to use the sql query tool to generate sql statements for a query with some 15 tables and 2 subqueries with each 4 tables. this does actually work really nicely, and i get the records retrieved that i need. however, it has happened twice to me now that i had the rather complex visual query layout nicely arranged, and clicked into the scrollbar (or somewhere else on the right top of the screen), and flyspeed re-arranged all my layout and rendered the visual representation completely unintelligable. all nicely piled up at the top left of the screen. is there any possibility to switch this undesired feature off ?

1000 thanks

ingo