Hi @nottolino …
I could not resist 
I created a new user, and the following is what I understood from the test:
a) it really created a separate space for another user, like it was a new clean installation of /e/OS
b) it was possible to adjust all the settings / aspect / apps
c) I could switch Wifi on (no need to provide the password = network recognized by the device …), browse the web, download FDroid and apps from it
So, it was not the administrator / user mode I was looking for, but more a multi-user feature. I do not know if this is linked to the version of /e/ installed …