Nestable accordion - close all

Hello

I would like to have all items of my accordion (actually, there is only one element) closed by default. Even if I did not enter any value in the “Expand item indexes”, the first item is opened. Can I have it closed by default ?

Thanks
Philippe

It is supposed to be closed if not set to open.

Check this threat about the accordion and check the settings described in the post the link refers to