Mindmap withthe diagram extension

I’d like to display, and if possible edit, mind maps in xwiki.
I tried the mind map extensions but both seems deprecated, the last one was using flash.
I could see that there was a diagram extension, which is very nice. So I installed it, I thought I could use it instead thanks to the feature described in
Organization Charts and Mind Maps in draw.io - draw.io (2017 version). Unfortunatly it doesn’t seem possible (branch shape not available). Is it because of the draw.io version ?

Many thanks !