CORS problem

First I’m sorry for my english.

I need to use LibreNMS for important school project. I download the Ubuntu setup image and it works good.
But, I would like to use the API on another computer. The problem is that I’m stuck with the CORS error and I don’t know how to fix it.
I saw in the documentation a config for the cors but It didn’t work.

How can I enable CORS on my installation ?
Thank you