Unable to change the configuration of my new Regolith Linux installation

I am a new user of Regolith Linux. I'm just using the Desktop version with a Ubuntu 18.04. I followed the instructions on the website to customize my desktop by creating a new configuration file from the original:

$ mkdir -p ~/.config/regolith/i3
$ cp /etc/regolith/i3/config ~/.config/regolith/i3/config

After modifying the configuration file (to test, I just changed the name of a workspace), and reloading i3, the changes don't seem to be applied. Can someone help me please!