short script to list subdirectories

Hi,
i’m using the free plugin to have an accordion list of subdirectories and sub-sub directory of a parent directory. I would like this parent directory to be excluded by the list (not to be in the list as the first item that opens other items).

Which is the right way to do hat with the script?
[wpb_category_accordion taxonomy=”category” orderby=”name” order=”ASC” show_count=”no” hide_empty=”yes” icon=”+”]

If it is not possible by the script, could I get it with the pro-version using widget? Because looking to your short video it seems there’s no option for that.

Thanks a lot.