Wrong screen size for diskdrake started from live install

When I click on live install, I choose custom partitionning :




I get this window : The partitions are not easily readable because they are too small. The window is 541x377 pixel


Even if I widen the window, all the contents fits accordingly, but the partitions remain at the same size



If I start live-install, and widen the window as below..




... This time the partitions are readable





By default, the size of diskdrake started from a command line on my system is 624x411