How to have a header multiline

Hello Franck,
 
Thank you for the question.
Our pivot table is designed to visualize only single lines, but you can customize it using CSS to show multiple lines in headers.
Please check the following sample: https://jsfiddle.net/flexmonster/euL68hzr/
Also, you need to adjust header row height manually (in the report config).
 
Hope it helps.
 
Regards,
Ian
 

Hello Franck,
Thank you for writing. You can set the tooltip to any cell using customizeCell approach. 
Please see the example here: https://jsfiddle.net/flexmonster/euL68hzr/16/.
Let us know if the suggested approach works fine for you.
Regards,
Dmytro