Crosstab Column Title on 2 lines

Hello everybody,

Here my issue : in a crosstab, i have a column who display percent data but which have a long title.

When i reduce column size, my title is reduced too and column title is not readable anymore.

I have found how to increase first row height but i dont know how to write column title on 2 "lines" in this first row (like in a Excel sheet for example).

I found this tutorial about customizing : Customize your layout in SAP BusinessObjects Design Studio but i didn't find answer for this issue.

PS : I'm working on Design Studio Version 15.0.6

Thank for your help !

Regards.

Jonas.