Change size of classes in class diagram (UML)

Me and my team are building a "rather" big project in java with multiple inner dependencies. We want a nice looking Class Diagram. After some time looking things up we found that IntelliJ has a very nice feature to generate everything. He does the job pretty good but there is one major issue.

Often we have long names of methods, or when the returnvalue is a List<ofATypeWithALongName> the information is not properly displayed anymore

example can be seen at https://dl.dropboxusercontent.com/u/66502009/demobug.png 

The logical answer would be to scale the class box so that the width enlarges a bit, but this seems impossible (?)

Is this a bug? Can it be fixed, or is it intended behaviour. I searched the forum and the help documentation but without any results, thanks in advance!

Btw: I use IntelliJ IDEA 15.0.4 (Ultimate).

Kind regards