It seems that Shape option is not activate. How can I activate it?
Many thanks
I highly recommend using an improved version of Sapling that can be download from GitHub: https://github.com/abpy/improved-sapling-tree-generator/archive/master.zip
Also, you can find this manual and presets useful too: https://blenderartists.org/forum/showthread.php?395082-Blender-Sapling-Tree-Tutorial-%2528free-download%2529