How to move this window?
Quit Filezilla, go to ~/.filezilla/ and open filezilla.xml with a text editor. Search for name="Window position and size", enter appropriate values and save the file.
On my 1200p x 1920p monitor it looks like this: &lt;Setting name="Window position and size" type="string"&gt;0 10 33 1463 920 &lt;/Setting&gt;  

(I don't know what the leading 0 means but 10 is the distance to the left, 33 is the distance to the top, 1463 is the x-size and 920 probably should be the y-size of the window; my real y-size was about 1045)