Beagle-0.3.9 result pages - each result items take too much space.

Hello,

I 'm just installed the beagle-0.3.9 and found it is a useful tool.
I have a question for you guys.
The items (I mean the space between items) in the result pages (GUI) are too big.  I see this under folders of the Images and  documents except the conversations. Do you know why? Could you tell me how to fix this?

Thanks,
JS