Hi Lele,
Have you tried version 2.6?
http://gqrx.dk/download/gqrx-sdr-for-the-raspberry-pi
It may work better than 2.5, although as I have written in a recent
thread, gqrx wasn't designed for such small screens (and definitely
not touch) so it will never be perfect unless we do a significant
rewrite of the UI.
Also note that you can rearrange the control "boxes" and move them to
take up less vertical space.
Alex